Javascript Control Flow Question

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#1 
const checkThatTwoPlusTwoEqualsFourAMillionTimes = () => {
  for(let i = 1; i <= 1000000; i++) {
    if ( (2 + 2) != 4) {
      console.log('Something has gone very wrong :( ');
    }
  }
};

const addTwo = num => num + 2;

const timeFuncRuntime = funcParameter => {
  let t1 = Date.now();
  funcParameter();
  let t2 = Date.now();
  return t2 - t1;
};

// Write your code below
let time2p2 = timeFuncRuntime(checkThatTwoPlusTwoEqualsFourAMillionTimes);

const checkConsistentOutput = (func,val) => {
  let first = func(val);
  let second = func(val);

  if(first == second) {
    return first;
  } else {
    return 'This function returned inconsistent results';
  }
}

checkConsistentOutput(addTwo,2);

Can any one explain the flow of this program?

#2

The bulk of the flow is in the loop of the first function which is called from the second function. The loop runs a million iterations then returns to the runtime function. A timestamp is acquired before the call, and after the return. Their difference is the run time.

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