Conquering Repetition: Effective Techniques for Repeating Strings in Javascript

This is the most straightforward and efficient way to repeat a string in modern Javascript. The repeat() method is built into the String object and takes one argument: the number of repetitions. Here's an example:

const str = "Hello ";
const repeatedStr = str.repeat(3); // repeats the string 3 times
console.log(repeatedStr); // Output: "Hello Hello Hello "

Using a for loop:

This approach iterates through a loop a specific number of times, concatenating the string to a new variable in each iteration. Here's an example:

const str = "World";
let repeatedStr = "";
for (let i = 0; i < 5; i++) {
  repeatedStr += str;
}
console.log(repeatedStr); // Output: "WorldWorldWorldWorldWorld"

Similar to the for loop, this method uses a while loop to repeat the concatenation process until a counter variable reaches the desired number of repetitions. Here's an example:

const str = "!";
let repeatedStr = "";
let i = 0;
while (i < 3) {
  repeatedStr += str;
  i++;
}
console.log(repeatedStr); // Output: "!!!""

• Negative repetition count: Both repeat() and loops throw errors if you provide a negative count. You can handle this by checking the count before repeating and throwing an error or setting a default value like 0.
• Large repetition count: Using a loop for very large repetitions can be slow. For extreme cases, consider alternative methods like creating an array of the string and joining it with the desired separator.