CODEWITHSUNDEEP
javascript
Dave
Dave

Reputation: 2018

Change original variable value by changing value of passed function parameter

Is it possible to change the variable value with function like example below? Whenever I change the passed parameter value the original value doesn't change. Why is this happening?

let b = 3;
function t(n) {
    n = 5; 
}

t(b)
console.log(b) // still 3

I know this can be done like this, but I am wondering why the example above wont work.

let b = 3;

function t() {
    return 5;
}

b = t();
console.log(b)

Upvotes: 0

Views: 46

Answers (1)

Justinas
Justinas

Reputation: 43479

Passing scalar values to function will pass them by value, not by reference.

One solution would be to pass it as object:

let b = {value: 3};

function t(n) {
    n.value = 5; 
}

t(b);
console.log(b.value);

Upvotes: 2

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