Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @license Apache-2.0
*
* Copyright (c) 2023 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 nextGraphemeClusterBreak = require( '@stdlib/string/next-grapheme-cluster-break' );
// MAIN //
/**
* Reverses the grapheme clusters (i.e., user-perceived characters) of a string.
*
* @param {string} str - input string
* @returns {string} output string
*
* @example
* var out = reverse( 'last man standing' );
* // returns 'gnidnats nam tsal'
*
* @example
* var out = reverse( 'presidential election' );
* // returns 'noitcele laitnediserp'
*
* @example
* var out = reverse( 'JavaScript' );
* // returns 'tpircSavaJ'
*
* @example
* var out = reverse( 'Hidden Treasures' );
* // returns 'serusaerT neddiH'
*
* @example
* var out = reverse( '🐶🐮🐷🐰🐸' );
* // returns '🐸🐰🐷🐮🐶'
*/
function reverse( str ) {
var cluster;
var out;
var idx;
var brk;
var i;
out = '';
idx = 0;
while ( idx < str.length ) {
brk = nextGraphemeClusterBreak( str, idx );
if ( brk === -1 ) {
brk = str.length;
}
cluster = '';
for ( i = idx; i < brk; i++ ) {
cluster += str.charAt( i );
}
out = cluster + out;
idx = brk;
}
return out;
}
// EXPORTS //
module.exports = reverse;
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