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To force a number value in a to a bit signed integer value, use a 0.
This works because the bitwise operator only works for bit integer values meaning it can only pay attention to 32 bits and any other bits will be lost.
Numbers 23 Special Values There are several special values spread across the various types that the alert JS developer needs to be aware of, and use properly. The Nonvalue Values For the undefined type, there is one and only one value: undefined.
For the null type, there is one and only one value: null. So for both of them, the label is both its type and its value.
You Don’t Know JS: Up & Going
Other developers prefer to distinguish between them with nuance. However, unde fined is unfortunately an identifier.
Uh oh. But the void operator can be useful in a few other circumstances, if you need to ensure that an expression has no result value even if it has side effects. Special Numbers The number type includes several special values.
The not number, number Any mathematic operation you perform without both operands being numbers or values that can be interpreted as regular numbers in base 10 or base 16 will result in the operation failing to produce a valid number, in which case you will get the NaN value. So, NaN! A bit strange, huh?
We use the built-in global utility called isNaN.. Problem solved! Not so fast.
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You Don't Know JS: Click here to read this free ebook online. Previous Programming React Native. About The Author.
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Launching Xcode Launching Visual Studio Latest commit fe3ea17 Nov 17, Titles Read online free! download Now in print, but the ebook format is free!
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download Now Publishing These books are being released here as drafts, free to read, but are also being edited, produced, and published through O'Reilly. In-person Training The content for these books derives heavily from a series of training materials I teach professionally in both public and private-corporate workshop format: Contributions Any contributions you make to this effort are of course greatly appreciated.
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You Don't Know JS: Up & Going
Update issue templates. Nov 17, Sep 12, We'll also look at how references work in their various usages across the language. These books aim to fix that, inspiring a strong appreciation for the language you can now, and should, deeply know. These books are being released here as drafts, free to read, but are also being edited, produced, and published through O'Reilly. What if we did need to compare two numbers, like 0.
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