Loop Through an Array Index to Search for a Letter in JavaScript

We are required to write a JavaScript function that takes in an array of strings as the first argument and a single character as the second argument.

The function should return true if the character specified by second argument exists in any of the strings of the array, false otherwise.

Example

The code for this will be −

const arr = ['first', 'second', 'third', 'last'];
const searchForLetter = (arr = [], letter = '') => {
   for(let i = 0; i < arr.length; i++){
      const el = arr[i];
      if(!el.includes(letter)){
         continue;
      };
      return true;
   };
   return false;
};
console.log(searchForLetter(arr, 's'));
console.log(searchForLetter(arr, 'x'));

Output

And the output in the console will be −

true
false