Returns an array of all elements that satisfies the provided testing function
undefined is returned if no element satisfies testing function
The callback function for .filter() accepts the following parameters:
element: (required) current element being processed in the array.
index: (optional) index of the current element being processed in the array
array: (optional) the array map was called upon
.filter() returns a new array containing all elements that match the testing function
Using traditional (ES5) function syntax
const result = arr.filter(function(item, index, array) {
// if true is returned, item is returned and iteration is stopped
// for falsy scenario returns undefined
})
Using arrow syntax (ES6)
const result = arr.filter((item, index, array) => {
// if true is returned, item is returned and iteration is stopped
// for falsy scenario returns undefined
})
const numbers = [5, 3, 13, 4, 11 ]
const greaterThan5 = numbers.filter((number) => {
return number > 5
})
console.log(greaterThan5) // [13, 11]
Use .filter() to return all words that have more than 6 characters in the words array.
Save the returned values to a variable declared with const called longWords