JavaScript - increasing a global variable as function argument

Question

If i have code, where i want in console "0 1" instead of "0 0"

function increase(f) { f++; }
var n = 0;
console.log(n);
increase(n);
console.log(n);

How to increase in such way the variable. I wish use like in c-language &v. Is it possible?

pass an object instead of a primitive value. – gurvinder372 Feb 22 '18 at 09:53 — gurvinder372, Feb 22 '18 at 09:53
just have to use `n = increase(n);` – codemonkeh Feb 22 '18 at 09:57 — codemonkeh, Feb 22 '18 at 09:57
Thank you Mr. Gurvinder372! – user2301515 Feb 22 '18 at 09:59 — user2301515, Feb 22 '18 at 09:59

score 2 · Answer 1 · answered Feb 22 '18 at 09:57

There is nothing increase can do to the parameter f that will affect the variable n in your example.

When you do increase(n), the value of n is passed into increase. That value is not in any way linked to the variable n.

(This is called "pass by value;" JavaScript is a purely pass-by-value language, more in this question's answers.)

Instead, have increase return the new value, and assign it to n.

1 Answers1