Why is using a generator function slower than filling and iterating an array in this example?

Question

A Tale of Two Functions

I have one function that fills an array up to a specified value:

function getNumberArray(maxValue) {
    const a         


        

Answer 1

Try replacing the 'let' in the generator function with a function scoped 'var'. It seems that the 'let' inside the loop incurs a lot of overhead. Only use let if you absolutely have to.