text: /*
  function mutation(arr) {
    let test = arr[1].toLowerCase();
    let target = arr[0].toLowerCase();
    for (let i = 0; i < test.length; i++) {
      if (target.indexOf(test[i]) < 0) return false;
    }
    return true;
  }
  */
  
  /*
  function mutation(arr) {
    return arr[1]
      .toLowerCase()
      .split("")
      .every(function(letter) {
        return arr[0].toLowerCase().indexOf(letter) != -1;
      });
  }
  */
  
  /*
  function mutation([ target, test ], i = 0) {
    target = target.toLowerCase();
    test = test.toLowerCase();
    return i >= test.length
      ? true
      : !target.includes(test[i])
        ? false
        : mutation([ target, test ], i + 1);
  }
  */
  
  
  const mutation = (arr) => {
    const filter = arr[1].toLowerCase().split("").filter((char) => {
      return  !arr[0].toLowerCase().includes(char); 
    });
    return !filter.length > 0;
  };
  
  
  const log = output => console.log(output);
  log(mutation(["Mary", "Army"]));