JavaScript Snippets

JavaScript for Kids
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1) Get last array element
var lastElement = arr[arr.length - 1];

2) Get random array element
var randElement = arr[Math.floor(Math.random() * arr.length)];

3) Get distance b/n 2 points
// target passed as object ex. target{x:49,y:102}
var getDistance = function(event, target){
    var diffX = event.offsetX - target.x;
    var diffY = event.offsetY - target.y;
    return Math.sqrt((diffX * diffX) + (diffY * diffY));
};