Array Iteration
๐จโ๐ผ Excellent! These methods are the bread and butter of JavaScript programming.
๐ฆ More iteration methods you'll use:
const numbers = [1, 2, 3, 4, 5]
// Find first element matching condition
numbers.find((n) => n > 3) // 4
// Check if ANY element matches
numbers.some((n) => n > 4) // true
// Check if ALL elements match
numbers.every((n) => n > 0) // true
// Reduce to single value
numbers.reduce((sum, n) => sum + n, 0) // 15
map and filter are especially important because they don't modify the
original array. This "immutable" pattern is preferred in modern JavaScript and
is essential in frameworks like React.You can also chain these methods:
numbers.filter((n) => n > 2).map((n) => n * 10)
// [30, 40, 50]