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

Remember to use Read-Search-Ask if you get stuck. Try to pair program and write your own code

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

Hint: 1

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

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Hint: 2

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

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Hint: 3

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

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Spoiler Alert!

Solution ahead!

Basic Code Solution:

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

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

  return accumulatedStr;
}

Run Code

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

Intermediate Code Solution:

function repeatStringNumTimes(str, num) {
  if(num < 0)
    return "";
  if(num === 1)
    return str;
  else
    return str + repeatStringNumTimes(str, num - 1);
}

Run Code

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

Advanced Code Solution:

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

repeatStringNumTimes("abc", 3);

Run Code

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

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See Wiki Challenge Solution Template for reference.