How to time different parts of a loop in Javascript

Question

Not a duplicate of How to measure time taken by a function to execute. Please actually read my question before marking it as a duplicate of something else. Regardless, it's been answered.

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I have code like

for (var i = 0 ; i < 10000 ; i++) {

    doSomething();

    doSomethingElse();

}

And I want to know how much time each function inside the loop is taking overall. How do I measure that?

Answer 1

var t1;
var t2;
var f1Time =0;
var f2Time =0;
for (var i = 0 ; i < 10000 ; i++) {
    t1 = performance.now();
    doSomething();
    t2  = performance.now();
    f1Time+= (t2 - t1);

    t1 = performance.now();
    doSomethingElse();
    t2  = performance.now();
    f1Time+=(t2 - t1);

}