Run results for: Trimming leading/trailing string of characters

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Safari/605.1.15

Browser: Safari 15

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Index Version (Jason Larke)	593174.3 Ops/sec
Regex Version (leaf)	91250.1 Ops/sec

Script Preparation code:

var TestString = " ,".repeat(200) + '='.repeat(20000) + " ,".repeat(200);

var regexTrim = function(str, str2) {
    return str.replace(/^[ ,]+|[ ,]+$/g, '');
};

function indexTrim(str, ch) {
    var start = 0, 
        end = str.length;

    while(start < end && (str[start] === ch[0] || str[start] === ch[1]))
        ++start;

    while(end > start && (str[end - 1] === ch[0] || str[end - 1] === ch[1]))
        --end;

    return (start > 0 || end < str.length) ? str.substring(start, end) : str;
}

function booleanTrim(str, ch) {
    return str.split(ch).filter(Boolean).join(ch);
}

function spreadTrim(str, ch) {
    const first = [...str].findIndex(char => char !== ch);
    const last = [...str].reverse().findIndex(char => char !== ch);
    return str.substring(first, str.length - last);
}

function substringTrim(str, ch) {
    while(str.charAt(0)==ch) {
        str = str.substring(1);
    }

    while(str.charAt(str.length-1)==ch) {
        str = str.substring(0,str.length-1);
    }

    return str;
}

Tests:

Index Version (Jason Larke)
indexTrim(TestString, " ,");
Regex Version (leaf)
regexTrim(TestString, " ,")

Run results for: Trimming leading/trailing string of characters

Index Version (Jason Larke)

Regex Version (leaf)