有人可以解释此代码的工作原理吗？

Question

So, I know this is related to higher order functions in JS, but I just don't understand how we're passing a value for m here. Also, after we declare a variable greaterThan10 , what does passing values to it do?

 function greaterThan(n) { return m => m > n; } let greaterThan10 = greaterThan(10); console.log(greaterThan10(11)); // → true 

Answer 1

m => m > n is shorthand syntax for a function .
This means that calling greaterThan(10) will create a function that could also be written like this:

function greaterThan10(m) {
  return m > 10; // this is still `m > n`, however, `n` cannot be changed from outside of the scope
}

Basically, m will be the parameter of the function returned by greaterThan(10) and n is the value passed to it, in this case 10 .

The technical term is arrow function expression . You can read more about it on MDN web docs .