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// Testing InstanceOf IC.
Array.prototype.sum = function() {
return this.reduce(( acc, cur ) => acc + cur, 0);
}
Iters = 20;
function resultArray(fn, obj) {
res = new Array();
for (var x = 0; x < Iters; x++) {
res.push(fn(obj) ? 1 : 0);
}
return res;
}
// Ensure alteration of .prototype invalidates IC
function basic() {};
protoA = { prop1: "1"};
basic.prototype = protoA;
io1 = x => { return x instanceof basic; }
var x = new basic();
beforePrototypeModification = resultArray(io1,x).sum(); //Attach and test IC
assertEq(beforePrototypeModification,Iters);
basic.prototype = {}; // Invalidate IC
afterPrototypeModification = resultArray(io1,x).sum(); //Test
assertEq(afterPrototypeModification,0);
//Primitive LHS returns false.
assertEq(resultArray(io1,0).sum(),0);
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