Added functions to extract major, minor, patch version

Author: Hypercubed

README.md

@@ -248,6 +248,9 @@ strings that they parse.
     same as `prepatch`. It increments the patch version, then makes a
     prerelease. If the input version is already a prerelease it simply
     increments it.
+* `major(v)`: Return the major version number.
+* `minor(v)`: Return the minor version number.
+* `patch(v)`: Return the patch version number.
 
 ### Comparison
 

semver.js

@@ -515,6 +515,21 @@ function rcompareIdentifiers(a, b) {
   return compareIdentifiers(b, a);
 }
 
+exports.major = major;
+function major(a, loose) {
+  return new SemVer(a, loose).major;
+}
+
+exports.minor = minor;
+function minor(a, loose) {
+  return new SemVer(a, loose).minor;
+}
+
+exports.patch = patch;
+function patch(a, loose) {
+  return new SemVer(a, loose).patch;
+}
+
 exports.compare = compare;
 function compare(a, b, loose) {
   return new SemVer(a, loose).compare(b);

test/majorMinorPatch.js

@@ -0,0 +1,72 @@
+var tap = require('tap');
+var test = tap.test;
+var semver = require('../semver.js');
+
+test('\nmajor tests', function(t) {
+	// [range, version]
+	// Version should be detectable despite extra characters
+	[
+		['1.2.3', 1],
+		[' 1.2.3 ', 1],
+		[' 2.2.3-4 ', 2],
+		[' 3.2.3-pre ', 3],
+		['v5.2.3', 5],
+		[' v8.2.3 ', 8],
+		['\t13.2.3', 13],
+		['=21.2.3', 21, true],
+		['v=34.2.3', 34, true]
+	].forEach(function(tuple) {
+		var range = tuple[0];
+		var version = tuple[1];
+		var loose = tuple[2] || false;
+		var msg = 'major(' + range + ') = ' + version;
+		t.equal(semver.major(range, loose), version, msg);
+	});
+	t.end();
+});
+
+test('\nminor tests', function(t) {
+	// [range, version]
+	// Version should be detectable despite extra characters
+	[
+		['1.1.3', 1],
+		[' 1.1.3 ', 1],
+		[' 1.2.3-4 ', 2],
+		[' 1.3.3-pre ', 3],
+		['v1.5.3', 5],
+		[' v1.8.3 ', 8],
+		['\t1.13.3', 13],
+		['=1.21.3', 21, true],
+		['v=1.34.3', 34, true]
+	].forEach(function(tuple) {
+		var range = tuple[0];
+		var version = tuple[1];
+		var loose = tuple[2] || false;
+		var msg = 'minor(' + range + ') = ' + version;
+		t.equal(semver.minor(range, loose), version, msg);
+	});
+	t.end();
+});
+
+test('\npatch tests', function(t) {
+	// [range, version]
+	// Version should be detectable despite extra characters
+	[
+		['1.2.1', 1],
+		[' 1.2.1 ', 1],
+		[' 1.2.2-4 ', 2],
+		[' 1.2.3-pre ', 3],
+		['v1.2.5', 5],
+		[' v1.2.8 ', 8],
+		['\t1.2.13', 13],
+		['=1.2.21', 21, true],
+		['v=1.2.34', 34, true]
+	].forEach(function(tuple) {
+		var range = tuple[0];
+		var version = tuple[1];
+		var loose = tuple[2] || false;
+		var msg = 'patch(' + range + ') = ' + version;
+		t.equal(semver.patch(range, loose), version, msg);
+	});
+	t.end();
+});