freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/repeat-a-string-repeat-a-string/index.md

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Repeat a String Repeat a String

Repeat a String Repeat a String

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Problem Explanation

The program is very simple, we have to take a variable and return that variable being repeated certain amount of times. No need to add space or anything, just keep repeating it into one single string.

Relevant Links

• Global String Object

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Hints

Hint 1

The program is very simple, we have to take a variable and return that variable being repeated certain amount of times. No need to add space or anything, just keep repeating it into one single string.

Hint 2

You can't edit strings, you will need to create a variable to store the new string.

Hint 3

Create a loop to repeat the code as many times as needed.

Hint 4

Make the variable created store the current value and append the word to it.

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Solutions

Solution 1 (Click to Show/Hide)

function repeatStringNumTimes(str, num) {
  var accumulatedStr = "";

  while (num > 0) {
    accumulatedStr += str;
    num--;
  }

  return accumulatedStr;
}

Code Explanation

• Create an empty string variable to store the repeated word.
• Use a while loop or for loop to repeat code as many times as needed according to num
• Then we just have to add the string to the variable created on step one, and increase or decrease num depending on how you set the loop.
• At the end of the loop, return the variable for the repeated word.

Relevant Links

• JS while Loop
• JS For Loops Explained

Solution 2 (Click to Show/Hide)

function repeatStringNumTimes(str, num) {
  if (num < 1) {
    return "";
  } else if (num === 1) {
    return str;
  } else {
    return str + repeatStringNumTimes(str, num - 1);
  }
}

Code Explanation

• This solution uses recursion.
• We check if num is negative and return an empty string if true.
• Then we check if it's equal to 1 and in that case we return the string itself.
• If not, we add the string to a call of our function with num being decreased by 1, which will add another str and another.. until eventually num is 1. And return that whole process.

Relevant Links

• Functions - Recursion

Solution 3 (Click to Show/Hide)

function repeatStringNumTimes(str, num) {
  return num > 0 ? str.repeat(num) : "";
}

repeatStringNumTimes("abc", 3);

Code Explanation

• This solution takes a declarative approach.
• It is similar to the third solution, except it uses the ternary operator form of the if statement.

Relevant Links

• JS Ternary