View difference between Paste ID: Fr4fEYKU and TU9zbnTJ

 // 29: array - `Array.from` static method
 // To do: make all tests pass, leave the assert lines unchanged!
 
 describe('`Array.from` converts an array-like object or list into an Array', () => {
 
   const arrayLike = {0: 'one', 1: 'two', length: 2};
 
   it('call `Array.from` with an array-like object', function() {
 //Use built in function Array.from()
     const arr = Array.from(arrayLike);
 
     assert.deepEqual(arr, ['one', 'two']);
   });
 
   it('a DOM node`s classList object can be converted', function() {
     document.body.classList.add('some');
     document.body.classList.add('other');
 //Make an array from the arraylike object
     const classList = Array.from(document.body.classList);
 
     assert.equal(''+classList, ''+['some', 'other']);
   });
 
   it('convert a NodeList to an Array and `filter()` works on it', function() {
 //Again we want to build an array from an arraylike object
     const nodeList = Array.from(document.querySelectorAll('body'));
     const bodies = nodeList.filter((node) => node === document.body);
 
     assert.deepEqual(bodies, [document.body]);
   });
 
   describe('custom conversion using a map function as second param', () => {
     it('we can modify the value before putting it in the array', function() {
 //Use toUpperCase() built in fn to cast to uppercase.
       const arr = Array.from(arrayLike, (value) => value.toUpperCase());
       assert.deepEqual(arr, ['ONE', 'TWO']);
     });
 
     it('and we also get the object`s key as second parameter', function() {
 //Add a second parameter called key. TBH it feels backwards but hey, it's kata time! Don't question it
       const arr = Array.from(arrayLike, (value, key) => `${key}=${value}`);
       assert.deepEqual(arr, ['0=one', '1=two']);
     });
   });
 
 });