Javascript Array Tricks

Useful techniques for working with JS arrays

const range = Array(100).fill(0).map((_, i) => i + 1);

// OR

const range = [...Array(100).keys()];

const unique = [...new Set(arr)];

const random = arr[Math.floor(Math.random() * arr.length)];

for(const [i, val] of arr.entries()) {
    console.log(i, val);
}

arr.forEach();
arr.map()
arr.filter();
arr.find();
arr.findIndex();
arr.reduce();