Merge pull request #63 from tdnelson2/develop

add absoluteValue function

Author: jhowardjr

index.js

@@ -28,4 +28,5 @@ module.exports = Object.assign(
   require('./lib/isPositiveInteger.js'),
   require('./lib/isDecimal.js'),
   require('./lib/isNegativeInteger.js'),
+  require('./lib/absoluteValue.js'),
 );

lib/absoluteValue.js

@@ -0,0 +1,23 @@
+
+const handleErrors = (params) => {
+  if (params.length === 0) throw new Error('Must provide one or more paramters');
+  if (params.some(param => typeof param !== 'number')) {
+    throw new Error('One of your parameters does not evaluate to a number');
+  }
+  // JS can only safely represent and compare integers
+  // between Number.MAX_SAFE_INTEGER and Number.MAX_SAFE_INTEGER
+  if (params.some(param => param > Number.MAX_SAFE_INTEGER || param < Number.MIN_SAFE_INTEGER)) {
+    throw new Error('Cannot reliably test primality of numbers larger than 9,007,199,254,740,991 or smaller than -9,007,199,254,740,991');
+  }
+};
+
+/**
+ * This function converts all numbers to a positive number
+ * @memberof variadic
+ * @author tdnelson2
+ * @param {...*} params - One or more parameters.
+ */
+exports.absoluteValue = (...params) => {
+  handleErrors(params);
+  return params.map(num => Math.abs(num));
+};