What does "use strict" do in JavaScript, and what is the reasoning behind it?

⬅️ JavaScript

🔗 stack overflow

• Inside native ECMAScript modules (with import and export statements) and ES6 classes, strict mode is always enabled and cannot be disabled.

Strict mode helps out in a couple ways:

• It catches some common coding bloopers, throwing exceptions.
• it prevents, or throws errors, when relatively “unsafe” actions are taken (such as gaining access to the global object).
• it disables features that are confusing or poorly thought out.
• you can apply “strict mode” to the whole file… Or you can use it only for a specific function

Resources

• https://johnresig.com/blog/ecmascript-5-strict-mode-json-and-more/