作为 Array.prototype.every() 方法的结果，我如何返回一个布尔数组？

Question

I am trying to map an array in order to get a Boolean for each iteration after comparing two arrays.

1. Compare if the values of array a are included into b .

2. Get an array of Booleans, returning the result of each iteration made in the every() method

I thought of using a combination of every() and map()

This is how far I went:

let a = [1,2,4];
let b = [1,2,3]

let answer = a.every(num => b.includes(num))


console.log(answer)
// returns false

I tried placing the callback of every() inside a map() method without success.

I know that every() iterates, so somehow it should be easy to the an array of each iteration like:

[true,true,false]

Thanks in advance!

Answer 1

 let a = [1,2,4]; let b = [1,2,3] let answer = a.map(num => b.includes(num)) console.log(answer)

Use map function

Map Function docs