How Can I Efficiently Repeat Strings in JavaScript?

Repeating Strings in JavaScript: A Simple Approach

In comparison to Perl's use of "x" for string repetition, JavaScript presents a more straightforward method with the "repeat" function. This built-in method allows you to replicate a string a specified number of times. Its usage is as follows:

"a".repeat(10); // Result: "aaaaaaaaaa"

Prior to the introduction of the "repeat" function, a common technique involved creating an array with the desired number of elements, populated with the string to be repeated, and then joining the array elements. For example:

Array(11).join("a"); // Result: "aaaaaaaaaa"

While this approach is less efficient, it provides a viable alternative for cases where support for older browsers is required.

Another option, especially in browsers that support it, is to utilize a loop to append the string to itself. Though less concise, this approach has been shown to be faster in specific browsers:

let result = "";
for (let i = 0; i < 10; i++) {
  result += "a";
}

// Result: "aaaaaaaaaa"

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