[JS] fCC exercise: https://codepen.io/adrianskar/pen/ELdaKp

mutations.js

// Mutations

function mutation(arr) {
  var a = arr[0].toLowerCase();
  var b = arr[1].toLowerCase();

  for (i=0; i<b.length; i++){
    if (a.indexOf(b[i]) < 0){
      return false;
    }
  }
  
  return true;
}

mutation(["hello", "Hello"]);