Capitalize the first letter of string in JavaScript

JavaScript performance comparison

Revision 2 of this test case created by

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
1
function capitalizeFirstLetter(string) {
    return string.charAt(0).toUpperCase() + string.slice(1);
}

capitalizeFirstLetter('string');
pending…
2
function capitalizeFirstLetter(string) {
    return string.replace(/^./, string[0].toUpperCase());
}

capitalizeFirstLetter('string');
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3
function capitalizeFirstLetter(string) {
    return string[0].toUpperCase() + string.slice(1);
}

capitalizeFirstLetter('string');
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4
String.prototype.capitalizeFirstLetter = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
}

'string'.capitalizeFirstLetter();
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