Is Measurable

measurable.js

// Recursive version

function isMeasurable(target, weights)
{
    if (weights.length == 0)
        return target == 0;

    var first = weights.shift();
    return 
        isMeasurable(target-first, weights) ||
        isMeasurable(target+first, weights) ||
        isMeasurable(target, weights);
}