‘Higher-order functions’ is a fancy term for functions that take other functions as arguments or that return functions. Very powerful! Last week, I casually dropped the term “higher-order ...

Your codespace will open once ready. There was a problem preparing your codespace, please try again. In JavaScript, the return statement is used in functions to ...

Arrow functions are often used in JavaScript's iterator methods ... It then takes that function's return value and adds it to a new array, leaving the original array unchanged. That new array, ...