time-to-botec

Benchmark sampling in different programming languages
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main.js (1861B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2018 The Stdlib Authors.
      5 *
      6 * Licensed under the Apache License, Version 2.0 (the "License");
      7 * you may not use this file except in compliance with the License.
      8 * You may obtain a copy of the License at
      9 *
     10 *    http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing, software
     13 * distributed under the License is distributed on an "AS IS" BASIS,
     14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15 * See the License for the specific language governing permissions and
     16 * limitations under the License.
     17 */
     18 
     19 'use strict';
     20 
     21 // MODULES //
     22 
     23 var prevGraphemeClusterBreak = require( './../../prev-grapheme-cluster-break' );
     24 var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
     25 var format = require( './../../format' );
     26 
     27 
     28 // MAIN //
     29 
     30 /**
     31 * Reverses a string.
     32 *
     33 * @param {string} str - input string
     34 * @throws {TypeError} must provide a string primitive
     35 * @returns {string} reversed string
     36 *
     37 * @example
     38 * var out = reverse( 'last man standing' );
     39 * // returns 'gnidnats nam tsal'
     40 *
     41 * @example
     42 * var out = reverse( 'presidential election' );
     43 * // returns 'noitcele laitnediserp'
     44 *
     45 * @example
     46 * var out = reverse( 'javaScript' );
     47 * // returns 'tpircSavaj'
     48 *
     49 * @example
     50 * var out = reverse( 'Hidden Treasures' );
     51 * // returns 'serusaerT neddiH'
     52 */
     53 function reverse( str ) {
     54 	var out;
     55 	var brk;
     56 	var idx;
     57 	var i;
     58 	if ( !isString( str ) ) {
     59 		throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
     60 	}
     61 	if ( str === '' ) {
     62 		return '';
     63 	}
     64 
     65 	out = [];
     66 	idx = str.length - 1;
     67 	while ( idx >= 0 ) {
     68 		brk = prevGraphemeClusterBreak( str, idx );
     69 		for ( i = brk + 1; i <= idx; i++ ) {
     70 			out.push( str.charAt( i ) );
     71 		}
     72 		idx = brk;
     73 	}
     74 	return out.join( '' );
     75 }
     76 
     77 
     78 // EXPORTS //
     79 
     80 module.exports = reverse;