locutus/esm/php/strings/trim.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

export function trim(str, charlist) {
    //      discuss at: https://locutus.io/php/trim/
    // parity verified: PHP 8.3
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //     improved by: mdsjack (https://www.mdsjack.bo.it)
    //     improved by: Alexander Ermolaev (https://snippets.dzone.com/user/AlexanderErmolaev)
    //     improved by: Kevin van Zonneveld (https://kvz.io)
    //     improved by: Steven Levithan (https://blog.stevenlevithan.com)
    //     improved by: Jack
    //        input by: Erkekjetter
    //        input by: DxGx
    //     bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)
    //       example 1: trim('    Kevin van Zonneveld    ')
    //       returns 1: 'Kevin van Zonneveld'
    //       example 2: trim('Hello World', 'Hdle')
    //       returns 2: 'o Wor'
    //       example 3: trim(16, 1)
    //       returns 3: '6'
    if (typeof str === 'undefined') {
        throw new Error('trim() expects at least 1 argument, 0 given');
    }
    let whitespace = [
        ' ',
        '\n',
        '\r',
        '\t',
        '\f',
        '\x0b',
        '\xa0',
        '\u2000',
        '\u2001',
        '\u2002',
        '\u2003',
        '\u2004',
        '\u2005',
        '\u2006',
        '\u2007',
        '\u2008',
        '\u2009',
        '\u200a',
        '\u200b',
        '\u2028',
        '\u2029',
        '\u3000',
    ].join('');
    let l = 0;
    let i = 0;
    let strValue = str === null ? '' : String(str);
    if (charlist) {
        whitespace = (charlist + '').replace(/([[\]().?/*{}+$^:])/g, '$1');
    }
    l = strValue.length;
    for (i = 0; i < l; i++) {
        if (!whitespace.includes(strValue.charAt(i))) {
            strValue = strValue.substring(i);
            break;
        }
    }
    l = strValue.length;
    for (i = l - 1; i >= 0; i--) {
        if (!whitespace.includes(strValue.charAt(i))) {
            strValue = strValue.substring(0, i + 1);
            break;
        }
    }
    return whitespace.includes(strValue.charAt(0)) ? '' : strValue;
}