every with includes

Pangram
Pangram in JavaScript 
export function isPangram(input) {
  const inputLowered = input.toLowerCase();
  return [...'abcdefghijklmnopqrstuvwxyz'].every((c) =>
    inputLowered.includes(c),
  );
}
  • This begins by lowercasing the input by using the String toLowerCase method.
  • It uses spread syntax to make an Array out of a string of the alphabet.
  • It then checks if all letters in the alphabet are contained in the input, using the Array method every with the String method includes.

If all letters of the alphabet are in the input, then the function returns true.

15th May 2024 · Found it useful?

Other Approaches to Pangram in JavaScript

Other ways our community solved this exercise
export function isPangram(input) {
  return new Set(input.toLowerCase().match(/[a-z]/g)).size === 26;
}
Set with size

Use Set with size. 

[...input].forEach((letter) => {
  if (letter >= "a" && letter <= "z")
    phrasemask |= 1 << (letter.charCodeAt(0) - A_LCASE);
  else if (letter >= "A" && letter <= "Z")
    phrasemask |= 1 << (letter.charCodeAt(0) - A_UCASE);
});
return phrasemask == ALL_26_BITS_SET;
Bit field

Use a bit field to keep track of used letters.