JavaScript Call Array key of Map object call array object javascript,call object array php,call array

That's correct, you have to use the same array (as in map.get(arr)), not just an equivalent array. Key comparison is like === (except that NaN matches itself). So just like this shows false:

console.log([0, 1, 2, 3] === [0, 1, 2, 3]); // false
Answer:1

Separate arrays aren't === to each other - your arr does not refer to the same array container as the [0,1,2,3] that you pass to map.get. To do something like this, you'd have to iterate over the map's keys and find the one whose values all match:

const map = new Map()
const arr = [0,1,2,3];
map.set(arr, "I am some number")

// Get a reference to the same `arr` whose key you set previously:
const arrKey = [...map.keys()].find(
  key => Array.isArray(key) && JSON.stringify(key) === JSON.stringify([0, 1, 2, 3])
);
console.log(map.get(arrKey));
Answer:2

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