99 lines
2.2 KiB
JavaScript
99 lines
2.2 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var lowercase = require( '@stdlib/string/lowercase' );
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var replace = require( '@stdlib/string/replace' );
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var isString = require( './../../is-string' ).isPrimitive;
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// VARIABLES //
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var RE_NON_ALPHANUMERIC = /[^a-z0-9]/g;
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// FUNCTIONS //
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/**
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* Comparator function for sorting characters in ascending order.
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*
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* @private
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* @param {string} a - character
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* @param {string} b - character
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* @returns {number} comparison value
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*/
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function ascending( a, b ) {
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if ( a < b ) {
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return -1;
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}
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if ( a === b ) {
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return 0;
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}
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return 1;
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}
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// MAIN //
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/**
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* Tests if a value is an anagram.
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*
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* @param {string} str - comparison string
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* @param {*} x - value to test
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* @throws {TypeError} first argument must be a string primitive
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* @returns {boolean} boolean indicating if a value is an anagram
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*
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* @example
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* var bool = isAnagram( 'I am a weakish speller', 'William Shakespeare' );
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* // returns true
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*
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* @example
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* var bool = isAnagram( 'bat', 'tabba' );
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* // returns false
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*/
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function isAnagram( str, x ) {
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if ( !isString( str ) ) {
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throw new TypeError( 'invalid argument. First argument must be a string primitive. Value: `' + str + '`.' );
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}
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if ( !isString( x ) ) {
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return false;
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}
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str = lowercase( str );
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str = replace( str, RE_NON_ALPHANUMERIC, '' );
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x = lowercase( x );
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x = replace( x, RE_NON_ALPHANUMERIC, '' );
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if ( str.length !== x.length ) {
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return false;
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}
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str = str.split( '' )
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.sort( ascending )
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.join( '' );
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x = x.split( '' )
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.sort( ascending )
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.join( '' );
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return ( str === x );
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}
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// EXPORTS //
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module.exports = isAnagram;
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