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joaquinelio 2021-06-19 21:21:24 -03:00 • committed by GitHub
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1-js/04-object-basics/09-object-toprimitive/article.md
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@ -9,7 +9,7 @@ In case of such operations, objects are auto-converted to primitives, and then t
That's an important limitation, as the result of `obj1 + obj2` can't be another object! That's an important limitation, as the result of `obj1 + obj2` can't be another object!
E.g. we can't make objects representing vectors or matrices (or archievements or whatever), add them and expect a "summed" object as the result. Such architectural feats are automatically "off the board". E.g. we can't make objects representing vectors or matrices (or achievements or whatever), add them and expect a "summed" object as the result. Such architectural feats are automatically "off the board".
So, because we can't do much here, there's no maths with objects in real projects. When it happens, it's usually because of a coding mistake. So, because we can't do much here, there's no maths with objects in real projects. When it happens, it's usually because of a coding mistake.
@ -133,7 +133,7 @@ As we can see from the code, `user` becomes a self-descriptive string or a money
If there's no `Symbol.toPrimitive` then JavaScript tries to find methods `toString` and `valueOf`: If there's no `Symbol.toPrimitive` then JavaScript tries to find methods `toString` and `valueOf`:
- For the "string" hint: `toString`, and if it doesn't exist, then `valueOf` (so `toString` has the priority for stirng conversions). - For the "string" hint: `toString`, and if it doesn't exist, then `valueOf` (so `toString` has the priority for string conversions).
- For other hints: `valueOf`, and if it doesn't exist, then `toString` (so `valueOf` has the priority for maths). - For other hints: `valueOf`, and if it doesn't exist, then `toString` (so `valueOf` has the priority for maths).
Methods `toString` and `valueOf` come from ancient times. They are not symbols (symbols did not exist that long ago), but rather "regular" string-named methods. They provide an alternative "old-style" way to implement the conversion. Methods `toString` and `valueOf` come from ancient times. They are not symbols (symbols did not exist that long ago), but rather "regular" string-named methods. They provide an alternative "old-style" way to implement the conversion.