# Looping through Map collections

Let's have some `Map` collection:

`let map = new Map; let arr1 = [1, 2]; let arr2 = [3, 4]; map.set(arr1, 'data1'); map.set(arr2, 'data2');`

This collection can be iterated using the `for-of` loop:

`for (let elem of map) { }`

In this case, arrays of key-value pairs will fall into the `elem`. The first element will be the key and the second element will be the value:

`for (let elem of map) { console.log(elem); // first [[1, 2], 'data1'], then [[3, 4], 'data2'] }`

You can separate keys and values using destructuring:

`for (let [key, elem] of map) { console.log(key); console.log(elem); }`
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