Strict mode article should reflect current ES6 instead of ES5

[vwkd]

Request type

• Please close this issue, I accidentally submitted it without adding any details
• New documentation
• Correction or update

Details

The Strict Mode article seems to not clearly reflect how strict mode works with the current version ES6. Many statements still refer to how strict mode worked with ES5 primarily. Now that ES6 is standard, refering to ES5 behavior primarily becomes just wrong.

For example, refer to this sentence about function definitions in block scope.

Second, strict mode prohibits function statements, not at the top level of a script or function

Prohibited in ES5, but allowed in ES6. Also the example that follows clearly only shows ES5 behavior. So in ES6 this statement is not true anymore, but the only thing there is is a small aside in the form of sentence

Note that function statements outside top level are permitted in ES2015.

The article should reflect primarily ES6 behavior, and only mention old ES5 behavior as an aside, instead of vice versa.

Just to preempt the question, why I create this issue instead of changing the wiki myself: Since I'm currently learning about strict mode, I feel not confident enough to change the wiki about a topic that I feel like I haven't understood yet. I hope somebody that feels more confident can look through the article and update it.

MDN URL: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode

[Josh-Cena]

Fixed by #14186 already

[teoli2003]

Close per comment.