Run results for: Trimming leading/trailing characters Bounds Fix2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36 Edg/91.0.864.59

Browser: Chrome 91

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Index Version (Jason Larke)	5892355.5 Ops/sec
Regex Version (leaf)	1718431.1 Ops/sec
Boolean Filter Version (mbaer3000)	1436345.2 Ops/sec
Spread Version (Robin F.)	1809522.8 Ops/sec
Substring Version (Pho3niX83)	5123789.0 Ops/sec
Index Version (Jason Larke) B	5859019.0 Ops/sec

Script Preparation code:

var TestString = '+'.repeat(2) + '='.repeat(20) + '+'.repeat(1);

var regexTrim = function(str, ch) {
    if (ch === ']') ch = '\\]';
    else if (ch === '^') ch = '\\^';
    else if (ch === '\\') ch = '\\\\';
    return str.replace(new RegExp('^[' + ch + ']+|[' + ch + ']+$', 'g'), '');
};

function indexTrim(str, ch) {
    var start = 0, 
        end = str.length;

    while(start < end && str[start] === ch)
        ++start;

    while(end > start && str[end - 1] === ch)
        --end;

    return (start > 0 || end < str.length) ? str.substring(start, end) : str;
}

function indexTrimB(str, ch) {
    var start = 0, 
        end = str.length - 1;

    while(start <= end && str[start] === ch)
        ++start;

    while(end >= start && str[end] === ch)
        --end;

    return start > 0 || end + 1 < str.length ? str.substring(start, end + 1) : 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, '+')
Boolean Filter Version (mbaer3000)
booleanTrim(TestString, '+')
Spread Version (Robin F.)
spreadTrim(TestString, '+')
Substring Version (Pho3niX83)
substringTrim(TestString, '+')
Index Version (Jason Larke) B
indexTrimB(TestString, '+');

Run results for: Trimming leading/trailing characters Bounds Fix2

Index Version (Jason Larke)

Regex Version (leaf)

Boolean Filter Version (mbaer3000)

Spread Version (Robin F.)

Substring Version (Pho3niX83)

Index Version (Jason Larke) B