Javascript Closure Not Taking Inputs Consistently

I have two javascript closures and I'm trying to understand why one will accept and input with a particular syntax and the other will reject. function multiply(factor) { var ace

Solution 1:

The difference is whether you are creating the closure right away through an IIFE, or a function that makes the closure when called.

Your first snippet written in the second style would be

var yup = (functionmultiply(factor) {
  returnfunctionace(number) {
    return number*factor;
  };
})(4); // the multiply(4) call is inlined into the statement with the definitionconsole.log(yup(5));

Your second snippet written in the first style would be

functionmakeAdd(k) {
  console.log(k);
  var counter = k;
  returnfunction (j) {
    counter += 1;
    return counter*j;
  }
}
var add = makeAdd(3);
add();
console.log(add(5));