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There also is another useful method for finding out whether is part of an array or not and that's the

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includes method,

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though it's also most useful for primitive values because it also just checks values like index of

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does.

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So just wanted to throw this in here real quick,

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we could for example check if test results includes a value of let's say 10.99, which it does.

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This will then return true or false and therefore includes is a great choice

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if you're not interested in the index and also not interested in the value but just want to know whether

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it's part of the array or not. Though it's important to keep in mind that index of will return -1

10
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if something wasn't found.

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So this is essentially the same here as running index of and comparing that to not being equal to

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-1

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because if that is not equal to -1, we know that it exists.

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If it is equal to -1, it does not exist but of course that's a bit shorter and say saves us this

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extra comparison

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so if you only are interested in knowing whether it's part or not, includes this nice to have for primitive

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values.

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So here if I reload, I see true twice because it is part of that array.