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JavaScript MCQs

Performance-wise, which is the fastest way of repeating a string in JavaScript?

String.prototype.repeat = function( num ) { return new Array( num + 1 ).join( this ); }

function repeat(pattern, count) { if (count < 1) return ''; var result = ''; while (count > 0) { if (count & 1) result += pattern; count >>= 1, pattern += pattern; } return result; }

String.prototype.repeat = function(count) { if (count < 1) return ''; var result = '', pattern = this.valueOf(); while (count > 0) { if (count & 1) result += pattern; count >>= 1, pattern += pattern; } return result; };

String.prototype.repeat = function (n, d) { return --n ? this + (d || '') + this.repeat(n, d) : '' + this };

Answer

Correct Answer: String.prototype.repeat = function( num ) { return new Array( num + 1 ).join( this ); }

Explanation:

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