Short Video: Array Iteration

//forEach [1,2,3].forEach(function(item, index){ console.log(item, index) }) //map const three = [1,2,3] const doubled = three.map(function(item){ return item * 2 }) console.log(doubled) //filter const ints = [1,2,3] const evens = ints.filter(function(item){ return item % 2 === 0 }) console.log(evens) //reduce const sum = [1,2,3].reduce(function(result, item){ return result + item }) console.log(sum) //some const hasNegativeNumbers = [1,2,3,-1,4].some(function(item){ return item < 0 }) console.log(hasNegativeNumbers) //every const allPositiveNumbers = [1,2,3].every(function(item){ return item > 0 }) console.log(allPositiveNumbers) //find const objects = [{id: 'a'}, {id: 'b'}, {id: 'c'}] const found = objects.find(function(item){ return item.id === 'b' }) console.log(found) //find index const objects2 = [{id: 'a'}, {id: 'b'}, {id: 'c'}] const foundIndex = objects2.findIndex(function(item){ return item.id === 'b' }) console.log(foundIndex)