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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' );
var numGraphemeClusters = require( '@stdlib/string/num-grapheme-clusters' );
// MAIN //
/**
* Removes the last `n` grapheme clusters (i.e., user-perceived characters) of a string.
*
* @param {string} str - input string
* @param {NonNegativeInteger} n - number of grapheme clusters to remove
* @returns {string} output string
*
* @example
* var out = removeLast( 'last man standing', 1 );
* // returns 'last man standin'
*
* @example
* var out = removeLast( 'presidential election', 1 );
* // returns 'presidential electio'
*
* @example
* var out = removeLast( 'JavaScript', 1 );
* // returns 'JavaScrip'
*
* @example
* var out = removeLast( 'Hidden Treasures', 1 );
* // returns 'Hidden Treasure'
*
* @example
* var out = removeLast( '🐶🐮🐷🐰🐸', 2 );
* // returns '🐶🐮🐷'
*
* @example
* var out = removeLast( 'foo bar', 5 );
* // returns 'fo'
*/
function removeLast( str, n ) {
var total;
var num;
var i;
if ( n === 0 ) {
return str;
}
total = numGraphemeClusters( str );
if ( str === '' || total < n ) {
return '';
}
i = 0;
num = 0;
while ( num < total - n ) {
i = nextGraphemeClusterBreak( str, i );
num += 1;
}
return str.substring( 0, i );
}
// EXPORTS //
module.exports = removeLast;
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