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How to check if a map contains a key in Go?
...es two variables - val will receive either the value of "foo" from the map or a "zero value" (in this case the empty string) and ok will receive a bool that will be set to true if "foo" was actually present in the map
evaluates ok, which will be true if "foo" was in the map
If "foo" is indeed pres...
Can grep show only words that match search pattern?
Is there a way to make grep output "words" from files that match the search expression?
14 Answers
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How do I capture bash output to the Mac OS X clipboard?
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The pbcopy command does this.
For example, this puts the output from ls on the clipboard/pasteboard:
ls | pbcopy
And pbpaste does the reverse, writing to stdout from the clipboard:
pbpaste > ls.txt
You can use both together to filter content on th...
How do I verify that an Android apk is signed with a release certificate?
...the Android SDK
(means it is unsigned), otherwise you will find something for CN.
For more details see: http://developer.android.com/guide/publishing/app-signing.html
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How to check a not-defined variable in JavaScript
I wanted to check whether the variable is defined or not. For example, the following throws a not-defined error
14 Answer...
Difference between freeze and seal
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Object.seal
It prevents adding and/or removing properties from the sealed object; using delete will return false
It makes every existing property non-configurable: they cannot be converted from 'data descriptors' to 'accessor descriptors' (and vice versa), and...
How to use hex color values
I am trying to use hex color values in Swift, instead of the few standard ones that UIColor allows you to use, but I have no idea how to do it.
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How to Debug Variables in Smarty like in PHP var_dump()
...ere I assigned them. I need to know what is inside a particular variable; for instance, say I have a variable in smarty called member . I tried with {debug} but it didn't work, and no popup was shown.
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Programmatically get the cache line size?
All platforms welcome, please specify the platform for your answer.
8 Answers
8
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The most accurate way to check JS object's type?
The typeof operator doesn't really help us to find the real type of an object.
8 Answers
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