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Exercise 2

Which of the following values are valid keys for an object?

1
'1'
undefined
'hello world'
true
'true'

Solution

All the listed values are valid keys. Note, though, that JavaScript coerces the non-string key values to strings. Given the listed values, 1 and '1' represent the same key, as do true and 'true'. This equivalency will bite you at some point; it's inevitable, so be ready.

> let myObj = {}
> myObj[true] = 'hello'
> myObj['true'] = 'world'
> myObj[true]
= 'world'

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```ruby
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```ruby
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# highlight
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# endhighlight
end
```

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# highlight
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# endhighlight
end