FrontendDeveloper.in

JavaScript question detail

What are the list of cases error thrown from non-strict mode to strict mode

When you apply 'use strict'; syntax, some of the below cases will throw a SyntaxError before executing the script

  1. When you use Octal syntax
var n = 022;
  1. Using with statement
  2. When you use delete operator on a variable name
  3. Using eval or arguments as variable or function argument name
  4. When you use newly reserved keywords
  5. When you declare a function in a block and access it from outside of the block
if (someCondition) {
function f() {}
}
f(); // ReferenceError: f is not defined

Hence, the errors from above cases are helpful to avoid errors in development/production environments.

Back to all JavaScript questions
Get LinkedIn Premium at Rs 399