Fix: modifying the name of a named function expression results in TypeError only in strict mode

[liuxuelian]

… strict mode

Description

In the "Named function expression", the name of the function expression is read-only. However, the name of the function is modified inside the function body and does not cause an error in non-strict mode. However, it only causes TypeError in strict mode.

Therefore, the corrective this code needs to put a "use strict"; statement before any other statements to be correct, as demonstrated here:

"use strict";

function foo() {
  foo = 1;
}
foo();
console.log(foo); // 1
(function foo() {
  foo = 1; // TypeError: Assignment to constant variable.
})();

In Google Chrome, the result is as follows: (other browsers are similar)

Motivation

Additional details

Related issues and pull requests

[github-actions]

Preview URLs

• /en-US/docs/Web/JavaScript/Reference/Operators/function

(comment last updated: 2024-11-15 14:18:38)