[understandinges6] found errors

[mgryn...@yahoo.com]

I would like to report errors In Chapter 6 “Symbols and Symbols properties” (Ido not have page#, because I bought it as e-book)”.

In example on Symbol.replace overriding:

hasLengthOf10 = {

..., 

[Symbol.replace]: function( value, replacement) { return value.length = = = 10 ? replacement + value.substring( 10) : value; },

 ...

}

value.substring(10) expression in this context always evaluates to “undefined” and should not be there.

Also following 

 console.log( replace2); // "Hello John"

is incorrect and should be

 console.log( replace2); // “undefined”

[Nicholas Zakas]

Thanks, this was previously reported and fixed:
https://github.com/nzakas/understandinges6/issues/373

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