You could take Array.from and map the key/value pairs. let map = new Map().set('a', 1).set('b', 2), array = Array.from(map, ([name, ... ... <看更多>

find() 與filter() 很像，但find() 只會回傳一次值，且是第一次為true 的值。 var findEmpty = people.find(function(item, index, array){ }); ... ... <看更多>

Introduction to JavaScript Array map() method · First, define a function that calculates the area of a circle. · Then, pass the circleArea function to the map() ... ... <看更多>

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Data in JavaScript is often represented by an iterable (such as an array, ... of an array, filter an array using a predicate function, or map an array to a ... ... <看更多>