mnt

var input = [50, 52, 100, 80, 90, 1000];
var min = 0, diff = 0, currentMin = input[0], currentDiff = 0;

for(var i = 0; i < input.length; i++) {
    var current = input[i];

    //checks if this is the lowest point of the graph
    if(current < currentMin) {
        currentMin = current;
    }