closest_number_of_array.js

// Based on: https://stackoverflow.com/questions/8584902/get-closest-number-out-of-array

const arr = [360, 375, 414, 768, 1024];

// ES6
const closest = (num, arr) => {
    let curr = arr[0];
    let diff = Math.abs(num - curr);
    for (let i of arr) {
        const newDiff = Math.abs(num - i);
        if (newDiff < diff) {
            diff = newDiff;
            curr = i
        }
    }
    return curr;
}

//ES5
function closest(num, arr) {
    var curr = arr[0];
    var diff = Math.abs(num - curr);
    for (var val = 0; val < arr.length; val++) {
        var newDiff = Math.abs(num - arr[val]);
        if (newDiff < diff) {
            diff = newDiff;
            curr = arr[val];
        }
    }
    return curr;
}