asmjs
JavaScript performance comparison
Preparation code
<script>
function DiagModule(stdlib) {
// "use asm";
var sqrt = stdlib.Math.sqrt;
function square(x) {
x = +x;
return +(x*x);
}
function diag(x, y) {
x = +x;
y = +y;
return +sqrt(square(x) + square(y));
}
return { diag: diag };
}
var bogusGlobal = {
Math: {
sqrt: function(x) { return x * 2; }
}
};
var fast = DiagModule(window);
var slow = DiagModule(bogusGlobal); // produces purelyinterpreted version
</script>
Test runner
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Test  Ops/sec  

fast 

pending… 
slow 

pending… 
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