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Recursion for Coding Interviews in JavaScript

Remove Spaces and Tabs in a String

Explore how to use recursion to remove all spaces and tab characters from a string in JavaScript. This lesson helps you understand recursive base cases and conditions, enabling you to manipulate strings effectively for coding interviews.

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What does “Removing Tabs and Spaces from a String” mean?

Our task is to remove all tabs and spaces from a string. This includes the character \t and " " from a string.

Removing spaces from a string.
Removing spaces from a string.

Implementation

Javascript (babel-node)
function remove(string) {
  // Base case
  if (string.length == 0) {
      return "";
  }
  // Recursive case
  if (string[0] == "\t" || string[0] == " ") {
      return remove(string.substr(1));
  }
  else {
      return string[0] + remove(string.substr(1));
  }
}
// Driver Code
var myString = "Hello\tWorld";
console.log(remove(myString));

Explanation

Removing tabs from a null string "" ...