Primitive types and properties that are primitive types are pass by value, objec... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

Sawamara on Jan 25, 2018 | parent | context | favorite | on: Deep-copying in JavaScript

Primitive types and properties that are primitive types are pass by value, objects and functions are pass by reference.

k2xl on Jan 25, 2018 | [–]

It's still pass by value. The value of the object happens to be a reference to a memory location. A primitive also points to a memory location too.

windwake12 on Jan 25, 2018 | [–]

There's no difference

    let a = function bar() { };
    
    function foo( a ) {
      a = 2;
    }
    
    foo( a );
    
    console.log( a ); // bar

Consider applying for YC's Fall 2025 batch! Applications are open till Aug 4
Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact