diff --git a/lib/node_modules/@stdlib/array/base/count-if/README.md b/lib/node_modules/@stdlib/array/base/count-if/README.md
new file mode 100644
index 000000000000..368ab4a45690
--- /dev/null
+++ b/lib/node_modules/@stdlib/array/base/count-if/README.md
@@ -0,0 +1,145 @@
+
+
+# countIf
+
+> Count the number of elements in an array that satisfy the provided testing function.
+
+
+
+
+
+
+
+
+
+
+
+## Usage
+
+```javascript
+var countIf = require( '@stdlib/array/base/count-if' );
+```
+
+#### countIf( x, predicate\[, thisArg] )
+
+Counts the number of elements in an array that satisfy the provided testing function.
+
+```javascript
+var x = [ 0, 1, 0, 1, 2 ];
+
+function predicate( val ) {
+ return ( val % 2 === 0 );
+}
+
+var out = countIf( x, predicate );
+// returns 3
+```
+
+If a `predicate` function returns a truthy value, the function counts that value.
+
+The `predicate` function is provided three arguments:
+
+- **value**: current array element.
+- **index**: current array element index.
+- **arr**: input array.
+
+To set the `predicate` function execution context, provide a `thisArg`.
+
+```javascript
+var x = [ 1, 2, 3, 4 ];
+
+var context = {
+ 'target': 3
+};
+
+function predicate( value ) {
+ return ( value > this.target );
+}
+
+var out = countIf( x, predicate, context );
+// returns 1
+```
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+## Examples
+
+
+
+```javascript
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var countIf = require( '@stdlib/array/base/count-if' );
+
+var x = bernoulli( 100, 0.5, {
+ 'dtype': 'generic'
+});
+console.log( x );
+
+function predicate( val ) {
+ return val === 1;
+}
+var n = countIf( x, predicate );
+console.log( n );
+```
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/lib/node_modules/@stdlib/array/base/count-if/benchmark/benchmark.length.js b/lib/node_modules/@stdlib/array/base/count-if/benchmark/benchmark.length.js
new file mode 100644
index 000000000000..13a9bc4c09c6
--- /dev/null
+++ b/lib/node_modules/@stdlib/array/base/count-if/benchmark/benchmark.length.js
@@ -0,0 +1,100 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var bench = require( '@stdlib/bench' );
+var pow = require( '@stdlib/math/base/special/pow' );
+var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var pkg = require( './../package.json' ).name;
+var countIf = require( './../lib' );
+
+
+// FUNCTIONS //
+
+/**
+* Creates a benchmark function.
+*
+* @private
+* @param {PositiveInteger} len - array length
+* @returns {Function} benchmark function
+*/
+function createBenchmark( len ) {
+ var x = bernoulli( len, 0.5, {
+ 'dtype': 'generic'
+ });
+ return benchmark;
+
+ /**
+ * Benchmark function.
+ *
+ * @private
+ * @param {Benchmark} b - benchmark instance
+ */
+ function benchmark( b ) {
+ var out;
+ var i;
+
+ b.tic();
+ for ( i = 0; i < b.iterations; i++ ) {
+ out = countIf( x, function predicate( v ) {
+ return v === 1;
+ } );
+ if ( typeof out !== 'number' ) {
+ b.fail( 'should return a number' );
+ }
+ }
+ b.toc();
+ if ( !isNonNegativeInteger( out ) ) {
+ b.fail( 'should return a nonnegative integer' );
+ }
+ b.pass( 'benchmark finished' );
+ b.end();
+ }
+}
+
+
+// MAIN //
+
+/**
+* Main execution sequence.
+*
+* @private
+*/
+function main() {
+ var len;
+ var min;
+ var max;
+ var f;
+ var i;
+
+ min = 1; // 10^min
+ max = 6; // 10^max
+
+ for ( i = min; i <= max; i++ ) {
+ len = pow( 10, i );
+
+ f = createBenchmark( len );
+ bench( pkg+':dtype=generic,len='+len, f );
+ }
+}
+
+main();
diff --git a/lib/node_modules/@stdlib/array/base/count-if/docs/repl.txt b/lib/node_modules/@stdlib/array/base/count-if/docs/repl.txt
new file mode 100644
index 000000000000..457b1181c5f7
--- /dev/null
+++ b/lib/node_modules/@stdlib/array/base/count-if/docs/repl.txt
@@ -0,0 +1,32 @@
+
+{{alias}}( x, predicate[, thisArg] )
+ Counts the number of elements in an array that satisfy the provided testing
+ function.
+
+ Parameters
+ ----------
+ x: ArrayLikeObject
+ Input array.
+
+ predicate: Function
+ Testing function.
+
+ thisArg: any (optional)
+ Execution context.
+
+ Returns
+ -------
+ out: integer
+ Number of truthy values for which the testing function evaluates to
+ true.
+
+ Examples
+ --------
+ > var out = {{alias}}( [ 0, 1, 1 ], function predicate( v ) {
+ ... return v === 1;
+ ... } )
+ 2
+
+ See Also
+ --------
+
diff --git a/lib/node_modules/@stdlib/array/base/count-if/docs/types/index.d.ts b/lib/node_modules/@stdlib/array/base/count-if/docs/types/index.d.ts
new file mode 100644
index 000000000000..719556a52a39
--- /dev/null
+++ b/lib/node_modules/@stdlib/array/base/count-if/docs/types/index.d.ts
@@ -0,0 +1,90 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+// TypeScript Version: 4.1
+
+///
+
+import { Collection, AccessorArrayLike } from '@stdlib/types/array';
+
+/**
+* Returns a boolean indicating whether an element passes a test.
+*
+* @returns boolean indicating whether an element passes a test
+*/
+type Nullary = ( this: U ) => boolean;
+
+/**
+* Returns a boolean indicating whether an element passes a test.
+*
+* @param value - current array element
+* @returns boolean indicating whether an element passes a test
+*/
+type Unary = ( this: U, value: T ) => boolean;
+
+/**
+* Returns a boolean indicating whether an element passes a test.
+*
+* @param value - current array element
+* @param index - current array element index
+* @returns boolean indicating whether an element passes a test
+*/
+type Binary = ( this: U, value: T, index: number ) => boolean;
+
+/**
+* Returns a boolean indicating whether an element passes a test.
+*
+* @param value - current array element
+* @param index - current array element index
+* @param arr - input array
+* @returns boolean indicating whether an element passes a test
+*/
+type Ternary = ( this: U, value: T, index: number, arr: Collection | AccessorArrayLike ) => boolean;
+
+/**
+* Returns a boolean indicating whether an element passes a test.
+*
+* @param value - current array element
+* @param index - current array element index
+* @param arr - input array
+* @returns boolean indicating whether an element passes a test
+*/
+type Predicate = Nullary | Unary | Binary | Ternary;
+
+/**
+* Counts the number of truthy values in an array.
+*
+* @param x - input array
+* @param predicate - testing function
+* @param thisArg - function context
+* @returns number of values for which the provided function evaluates to true
+*
+* @example
+* var x = [ 0, 1, 0, 1 ];
+* function predicate( v ) {
+* return v > this;
+* }
+* var n = countIf( x, predicate, 0 );
+* // returns 2
+*/
+declare function countIf( x: Collection | AccessorArrayLike, predicate: Predicate, thisArg?: ThisParameterType> ): number;
+
+
+// EXPORTS //
+
+export = countIf;
diff --git a/lib/node_modules/@stdlib/array/base/count-if/docs/types/test.ts b/lib/node_modules/@stdlib/array/base/count-if/docs/types/test.ts
new file mode 100644
index 000000000000..44fb086bdf46
--- /dev/null
+++ b/lib/node_modules/@stdlib/array/base/count-if/docs/types/test.ts
@@ -0,0 +1,42 @@
+/*
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+import countIf from './index';
+
+
+// TESTS //
+
+// The function returns a number...
+{
+ countIf( [ 1, 2, 3 ], () => { return true } ); // $ExpectType number
+}
+
+// The compiler throws an error if the function is provided an argument which is not a collection or the function is not boolean returning...
+{
+ countIf( [ 5 ], function() { return 1 } ); // $ExpectError
+ countIf( true ); // $ExpectError
+ countIf( false, function() { return false} ); // $ExpectError
+ countIf( null ); // $ExpectError
+ countIf( [ {}, {} ], ()=>{} ); // $ExpectError
+}
+
+// The compiler throws an error if the function is provided an unsupported number of arguments...
+{
+ countIf(); // $ExpectError
+ countIf( [ 1, 2, 3 ], 2 ); // $ExpectError
+}
diff --git a/lib/node_modules/@stdlib/array/base/count-if/examples/index.js b/lib/node_modules/@stdlib/array/base/count-if/examples/index.js
new file mode 100644
index 000000000000..30d4a733c799
--- /dev/null
+++ b/lib/node_modules/@stdlib/array/base/count-if/examples/index.js
@@ -0,0 +1,36 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+var bernoulli = require( '@stdlib/random/array/bernoulli' );
+var countIf = require( './../lib' );
+
+var x = bernoulli( 100, 0.5, {
+ 'dtype': 'generic'
+});
+console.log( x );
+
+var threshold = 0;
+
+function predicate( val ) {
+ return val === 1;
+}
+
+var n = countIf( x, predicate, threshold );
+console.log( n );
diff --git a/lib/node_modules/@stdlib/array/base/count-if/lib/index.js b/lib/node_modules/@stdlib/array/base/count-if/lib/index.js
new file mode 100644
index 000000000000..af962706c435
--- /dev/null
+++ b/lib/node_modules/@stdlib/array/base/count-if/lib/index.js
@@ -0,0 +1,46 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+/**
+* Count the number of elements in an array that satisfy the provided testing function.
+*
+* @module @stdlib/array/base/count-if
+*
+* @example
+* var countIf = require( '@stdlib/array/base/count-if' );
+*
+* var x = [ 0, 1, 0, 1, 2 ];
+*
+* function predicate( value ) {
+* return ( value % 2 === 0 )
+* }
+*
+* var n = countIf( x, predicate );
+* // returns 3
+*/
+
+// MODULES //
+
+var main = require( './main.js' );
+
+
+// EXPORTS //
+
+module.exports = main;
diff --git a/lib/node_modules/@stdlib/array/base/count-if/lib/main.js b/lib/node_modules/@stdlib/array/base/count-if/lib/main.js
new file mode 100644
index 000000000000..898305980626
--- /dev/null
+++ b/lib/node_modules/@stdlib/array/base/count-if/lib/main.js
@@ -0,0 +1,163 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var isComplexTypedArray = require( '@stdlib/array/base/assert/is-complex-typed-array' );
+var isAccessorArray = require( '@stdlib/array/base/assert/is-accessor-array' );
+var resolveGetter = require( '@stdlib/array/base/resolve-getter' );
+var reinterpret = require( '@stdlib/strided/base/reinterpret-complex' );
+
+
+// FUNCTIONS //
+
+/**
+* Counts the number of elements in an indexed array that satisfy the provided testing function.
+*
+* @private
+* @param {Collection} x - input array
+* @param {Function} predicate - testing function
+* @param {*} [thisArg] - function context
+* @returns {NonNegativeInteger} number of values for which the provided function evaluates to true
+*
+* @example
+* var x = [ 0, 1, 0, 1 ];
+* function predicate( v ) {
+* return v > 0;
+* }
+* var n = indexed( x, predicate );
+* // returns 2
+*/
+function indexed( x, predicate, thisArg ) {
+ var n;
+ var i;
+
+ n = 0;
+ for ( i = 0; i < x.length; i++ ) {
+ if ( predicate.call( thisArg, x[ i ], i, x ) ) {
+ n += 1;
+ }
+ }
+ return n;
+}
+
+/**
+* Counts the number of elements in an accessor array that satisfy the provided testing function.
+*
+* @private
+* @param {Collection} x - input array
+* @param {Function} predicate - testing function
+* @param {*} [thisArg] - function context
+* @returns {NonNegativeInteger} number of values for which the provided function evaluates to true
+*
+* @example
+* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
+*
+* var x = toAccessorArray( [ 0, 1, 0, 1 ] );
+* function predicate( v ) {
+* return v > 0;
+* }
+* var n = accessors( x, predicate );
+* // returns 2
+*/
+function accessors( x, predicate, thisArg ) {
+ var get;
+ var n;
+ var i;
+
+ get = resolveGetter( x );
+
+ n = 0;
+ for ( i = 0; i < x.length; i++ ) {
+ if ( predicate.call( thisArg, get( x, i ), i, x ) ) {
+ n += 1;
+ }
+ }
+ return n;
+}
+
+/**
+* Counts the number of elements in a complex array that satisfy the provided testing function.
+*
+* @private
+* @param {Collection} x - input array
+* @param {Function} predicate - testing function
+* @param {*} [thisArg] - function context
+* @returns {NonNegativeInteger} number of values for which the provided function evaluates to true
+*
+* @example
+* var Complex128Array = require( '@stdlib/array/complex128' );
+*
+* var x = new Complex128Array( [ 1.0, 2.0, 0.0, 0.0, 3.0, 4.0, 0.0, 0.0 ] );
+* function predicate( v ) {
+* return v > 0;
+* }
+* var n = complex( x, predicate );
+* // returns 2
+*/
+function complex( x, predicate, thisArg ) {
+ var view;
+ var n;
+ var i;
+
+ view = reinterpret( x, 0 );
+
+ n = 0;
+ for ( i = 0; i < view.length; i += 2 ) {
+ if ( predicate.call( thisArg, view[ i ], i, view ) || predicate.call( thisArg, view[ i+1 ], i+1, view ) ) {
+ n += 1;
+ }
+ }
+ return n;
+}
+
+
+// MAIN //
+
+/**
+* Counts the number of elements in an array that satisfy the provided testing function.
+*
+* @param {Collection} x - input array
+* @param {Function} predicate - testing array
+* @param {*} [thisArg] - function context
+* @returns {NonNegativeInteger} number of truthy values
+*
+* @example
+* var x = [ 0, 1, 0, 1, 1 ];
+* function predicate( v ) {
+* return v > 0;
+* }
+* var n = countIf( x, predicate );
+* // returns 3
+*/
+function countIf( x, predicate, thisArg ) {
+ if ( isAccessorArray( x ) ) {
+ if ( isComplexTypedArray( x ) ) {
+ return complex( x, predicate, thisArg );
+ }
+ return accessors( x, predicate, thisArg );
+ }
+ return indexed( x, predicate, thisArg );
+}
+
+
+// EXPORTS //
+
+module.exports = countIf;
diff --git a/lib/node_modules/@stdlib/array/base/count-if/package.json b/lib/node_modules/@stdlib/array/base/count-if/package.json
new file mode 100644
index 000000000000..34355f2ab3b7
--- /dev/null
+++ b/lib/node_modules/@stdlib/array/base/count-if/package.json
@@ -0,0 +1,65 @@
+{
+ "name": "@stdlib/array/base/count-if",
+ "version": "0.0.0",
+ "description": "Count the number of elements in an array that satisfy the provided testing function.",
+ "license": "Apache-2.0",
+ "author": {
+ "name": "The Stdlib Authors",
+ "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+ },
+ "contributors": [
+ {
+ "name": "The Stdlib Authors",
+ "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
+ }
+ ],
+ "main": "./lib",
+ "directories": {
+ "benchmark": "./benchmark",
+ "doc": "./docs",
+ "example": "./examples",
+ "lib": "./lib",
+ "test": "./test"
+ },
+ "types": "./docs/types",
+ "scripts": {},
+ "homepage": "https://github.com/stdlib-js/stdlib",
+ "repository": {
+ "type": "git",
+ "url": "git://github.com/stdlib-js/stdlib.git"
+ },
+ "bugs": {
+ "url": "https://github.com/stdlib-js/stdlib/issues"
+ },
+ "dependencies": {},
+ "devDependencies": {},
+ "engines": {
+ "node": ">=0.10.0",
+ "npm": ">2.7.0"
+ },
+ "os": [
+ "aix",
+ "darwin",
+ "freebsd",
+ "linux",
+ "macos",
+ "openbsd",
+ "sunos",
+ "win32",
+ "windows"
+ ],
+ "keywords": [
+ "stdlib",
+ "stdtypes",
+ "types",
+ "data",
+ "structure",
+ "array",
+ "count",
+ "sum",
+ "summation",
+ "countif",
+ "total",
+ "truthy"
+ ]
+}
diff --git a/lib/node_modules/@stdlib/array/base/count-if/test/test.js b/lib/node_modules/@stdlib/array/base/count-if/test/test.js
new file mode 100644
index 000000000000..86fb05295f8d
--- /dev/null
+++ b/lib/node_modules/@stdlib/array/base/count-if/test/test.js
@@ -0,0 +1,231 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var Complex128Array = require( '@stdlib/array/complex128' );
+var Int32Array = require( '@stdlib/array/int32' );
+var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
+var countIf = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+ t.ok( true, __filename );
+ t.strictEqual( typeof countIf, 'function', 'main export is a function' );
+ t.end();
+});
+
+tape( 'the function counts the number of truthy values based on a testing function (generic)', function test( t ) {
+ var expected;
+ var actual;
+ var x;
+
+ x = [ 0, 1, 0, 1, 2 ];
+ expected = 3;
+ actual = countIf( x, function predicate( v ) {
+ return ( v % 2 === 0 );
+ });
+
+ t.strictEqual( actual, expected, 'returns expected value' );
+ t.end();
+});
+
+tape( 'the function counts the number of truthy values based on a testing function (accessors)', function test( t ) {
+ var expected;
+ var actual;
+ var x;
+
+ x = toAccessorArray([ 0, 1, 0, 1, 2 ]);
+ expected = 2;
+ actual = countIf( x, function predicate( v ) {
+ return v === 1;
+ });
+
+ t.strictEqual( actual, expected, 'returns expected value' );
+ t.end();
+});
+
+tape( 'the function counts the number of truthy values based on a testing function (real typed array)', function test( t ) {
+ var expected;
+ var actual;
+ var x;
+
+ x = new Int32Array([ 0, 1, 0, 1, 2 ]);
+ expected = 1;
+ actual = countIf( x, function predicate( v ) {
+ return v > 1;
+ });
+
+ t.strictEqual( actual, expected, 'returns expected value' );
+ t.end();
+});
+
+tape( 'the function counts the number of truthy values based on a testing function (complex typed array)', function test( t ) {
+ var expected;
+ var actual;
+ var x;
+
+ x = new Complex128Array([ 0.0, 0.0, 1.0, 0.0, 3.0, 4.0, 0.0, 5.0 ]);
+ expected = 3;
+ actual = countIf( x, function predicate( v ) {
+ return v === 0;
+ });
+
+ t.strictEqual( actual, expected, 'returns expected value' );
+ t.end();
+});
+
+tape( 'the function returns zero if provided an array of length `0`', function test( t ) {
+ var expected;
+ var actual;
+ var x;
+
+ expected = 0;
+
+ x = [];
+ actual = countIf( x, function predicate( v ) {
+ return v === 1;
+ });
+ t.strictEqual( actual, expected, 'returns expected value' );
+
+ x = toAccessorArray([]);
+ actual = countIf( x, function predicate( v ) {
+ return v === 1;
+ });
+ t.strictEqual( actual, expected, 'returns expected value' );
+
+ x = new Int32Array([]);
+ actual = countIf( x, function predicate( v ) {
+ return v === 1;
+ });
+ t.strictEqual( actual, expected, 'returns expected value' );
+
+ x = new Complex128Array([]);
+ actual = countIf( x, function predicate( v ) {
+ return v === 1;
+ });
+ t.strictEqual( actual, expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function returns zero if no truthy values are found', function test( t ) {
+ var expected;
+ var actual;
+ var x;
+
+ expected = 0;
+
+ x = [ 0, 0, 0, 0 ];
+ actual = countIf( x, function predicate( v ) {
+ return v === 1;
+ });
+ t.strictEqual( actual, expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function returns the length of the array if all values are truthy', function test( t ) {
+ var expected;
+ var actual;
+ var x;
+
+ x = [ 1, 1, 1, 1 ];
+ expected = x.length;
+
+ actual = countIf( x, function predicate( v ) {
+ return v === 1;
+ });
+ t.strictEqual( actual, expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function supports providing a custom execution context', function test( t ) {
+ var expected;
+ var context;
+ var actual;
+ var x;
+
+ context = {
+ 'threshold': 2
+ };
+ x = [ 1, 2, 3, 4, 5 ];
+ expected = 3; // Only values greater than 2
+ actual = countIf( x, function predicate( v ) {
+ return v > this.threshold; // eslint-disable-line no-invalid-this
+ }, context );
+
+ t.strictEqual( actual, expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function counts the number of objects with a custom predicate function using `thisArg`', function test( t ) {
+ var expected;
+ var thisArg;
+ var actual;
+ var x;
+
+ thisArg = {
+ 'target': 20
+ };
+ x = [
+ {
+ 'name': 'John',
+ 'value': 10
+ },
+ {
+ 'name': 'Jane',
+ 'value': 20
+ },
+ {
+ 'name': 'Doe',
+ 'value': 30
+ }
+ ];
+
+ // Count the number of objects where the value property matches the target
+ expected = 1; // One object have its value property equal to 20
+ actual = countIf( x, function predicate( v ) {
+ return v.value === this.target; // eslint-disable-line no-invalid-this
+ }, thisArg );
+
+ t.strictEqual( actual, expected, 'returns expected value' );
+
+ t.end();
+});
+
+tape( 'the function returns zero if provided an array with no truthy values (false, null, undefined are treated as non truthy values)', function test( t ) {
+ var expected;
+ var actual;
+ var x;
+
+ expected = 0;
+ x = [ false, 0, '', null, undefined ];
+ actual = countIf( x, function predicate( v ) {
+ return v; // Returns truthy values
+ });
+ t.strictEqual( actual, expected, 'returns expected value' );
+ t.end();
+});