How to Efficiently Repeat a String in JavaScript?

Repeat String in Javascript

Question:

How can we efficiently return a string repeated a specified number of times?

Answer:

Extended Approach:

The provided code defines a function repeat that iteratively constructs an array filled with the input string and then joins them to form the repeated string.

Concise Approach Using Array:

An alternative solution is to leverage the join method directly on the String object:

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

This method optimizes performance by avoiding array creation and subsequent joining operations.

Example:

"string to repeat\n".repeat(4); // "string to repeat\nstring to repeat\nstring to repeat\nstring to repeat\n"

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