another example

hipsterPythagoras.js

function findC(array){
    return array.filter(function(a){
        return Array.isArray(a) && a.length === 2;
    }).map(function(a){
        //x*x is much faster then Math.pow(a,2);
        return Math.sqrt(a[0]*a[0]+a[1]*a[1]);
    });
}