JSFiddle - React, Tailwind, and code Playground

HTML

<p id="output"></p>

JavaScript

function max(x, y){
    return x > y ? x : y;
}

function _max(x){
    return function(y){
        return x > y ? x : y;
    }
}

var brightness = [0.2, -0.3, 1.0, -0.5];
brightness = brightness.map(_max(0));

document.getElementById('output').textContent = brightness.toString();