Types & Grammar - Chapter 2 : TypeError while reversing a string.

[animeshk874]

https://github.com/getify/You-Dont-Know-JS/blob/master/types%20%26%20grammar/ch2.md#strings There's a code in this section that tries to use the Array.prototype.reverse function to reverse a string.

Array.prototype.reverse.call( a );
// still returns a String object wrapper (see Chapter 3)
// for "foo" :(

The comment says that it returns a String object wrapper. However, running it on Chrome 66 (and maybe other browsers too) gives a TypeError.

[getify]

I think the difference is you're running the code in strict mode.

[animeshk874]

Nope. It throws the error regardless of strict mode.

[getify]

Shrugs. This must have changed at some point. It used to silently ignore the attempt to assign to the read-only string when I wrote the book. I think what may have changed is the treatment of values that are passed through as this via .call(..).

[getify]

Note that the section in question is accurate in that it says Array.prototype.reverse(..) does not work. The manner in which it does not work is what has changed.

[animeshk874]

That's what I was trying to say. It's just the commented lines that need to be changed. :)