Algorithm to find the closest match (Closest predefined screen dimension)

// xs sm md lg xl 
var screenDims = [375, 540, 720, 960, 1140];

function getClosestScreenWidth(input) {
return screenDims.reduce((a, b) => {
return Math.abs(b - input) < Math.abs(a - input) ? b : a;
});
}



console.log(getClosestScreenWidth(640));
//720