Array.from converts an array-like object or list into an Array
call Array.from with an array-like object
const arrayLike = {0: 'one', 1: 'two', length: 2};
const arr = Array.to(arrayLikes);
assert.deepEqual(arr, ['one', 'two']);a DOM node's classList object can be converted
const domNode = document.createElement('span');
domNode.classList.add('some');
domNode.classList.add('other');
const classList = domNode.classList;
assert.equal(''+classList, ''+['some', 'other']);convert a NodeList to an Array and filter() works on it
const nodeList = document.createElement('span');
const divs = nodeList.filter((node) => node.tagName === 'div');
assert.deepEqual(divs.length, 0);
custom conversion using a map function as second param
we can modify the value before putting it in the array
const arrayLike = {0: 'one', 1: 'two', length: 2};
const arr = Array.from(arrayLike, (value) => value);
assert.deepEqual(arr, ['ONE', 'TWO']);and we also get the object's key as second parameter
const arrayLike = {0: 'one', 1: 'two', length: 2};
const arr = Array.from(arrayLike, (value) => `${key}=${value}`);
assert.deepEqual(arr, ['0=one', '1=two']);