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How do you downgrade rubygems?
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This worked for me when downgrading from 1.5.2 to 1.4.2 because of old rails version:
sudo gem update --system 1.4.2
More information about downgrading/upgrading rubygems: https://github.com/rubygems/rubygems/blob/master/UPGRADING.md
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Can you write nested functions in JavaScript?
...b(y) { // <-- inner function
return x + y; // <-- use variables from outer scope
}
return b; // <-- you can even return a function.
}
console.log(a(3)(4));
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How can I wait till the Parallel.ForEach completes
...l, Parallel.Foreach() will wait until all its branched tasks are complete. From the calling thread you can treat it as a single synchronous statement and for instance wrap it inside a try/catch.
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What is the difference between display: inline and display: inline-block?
...he browser here auto-detected the English part as LTR text and rendered it from left to right.
body {
text-align: right;
direction: rtl;
}
h2 {
display: block; /* just being explicit */
}
span {
display: inline;
}
<h2>
هذا عنوان طويل
<span>one...
How to hide the title bar for an Activity in XML with existing custom theme
...de note, the XML method is much safer and it also separates page structure from your code, (which is the entire purpose of the XMLs in the first place.)
– b1nary.atr0phy
Feb 16 '12 at 18:57
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assertEquals vs. assertEqual in python
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A 3.3 update: From 26.3.7.1.1. Deprecated aliases :
For historical reasons, some of the TestCase methods had one or more aliases that are now deprecated. The following table lists the correct names along with their deprecated aliases:
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LINQ where vs takewhile
...rence between TakeWhile & Where LINQ methods .I got the following data from MSDN .But It didn't make sense to me
6 Answ...
AsyncTaskLoader vs AsyncTask
...nd the v4 Compatibility Library it is possible to use AsyncTaskLoader . From what I understand, the AsyncTaskLoader can survive through config changes like screen flips.
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Why are unnamed namespaces used and what are their benefits?
...l. You could try making add_val more complex, or calling it multiple times from main in different circumstances.
– xioxox
Nov 4 '15 at 8:29
5
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Serializing object that contains cyclic object value
...y.isArray(obj)
? obj.map(x => decycle(x, s))
: Object.fromEntries(
Object.entries(obj)
.map(([k, v]) => [k, decycle(v, s)]));
}
//
let a = {b: [1, 2, 3]}
a.b.push(a);
console.log(JSON.stringify(decycle(a)))
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