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What is the difference between --save and --save-dev?
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--save-dev is used to save the package for development purpose.
Example: unit tests, minification..
--save is used to save the
package required for the application to run.
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How can I get the last 7 characters of a PHP string?
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Use substr() with a negative number for the 2nd argument.
$newstring = substr($dynamicstring, -7);
From the php docs:
string substr ( string $string , int $start [, int $length ] )
If start is negative, the returned string will start at the start'th character ...
How do I merge two javascript objects together in ES6+?
...ge/extend/assign in ES6 by using Object.assign:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
Syntax:
Object.assign(target, sources);
where ...sources represents the source object(s).
Example:
var obj1 = {name: 'Daisy', age: 30};
var obj2 = ...
How to set environment variables in Python?
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On some platforms, modifying os.environ will not actually modify the system environment either for the current process or child processes. See the docs for more info: docs.python.org/2/library/os.html#os.environ
– Ev...
The most sophisticated way for creating comma-separated Strings from a Collection/Array/List?
During my work with databases I noticed that I write query strings and in this strings I have to put several restrictions in the where-clause from a list/array/collection. Should look like this:
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Is it possible to override JavaScript's toString() function to provide meaningful output for debuggi
... [object Object] , which is not very helpful in figuring out what object (or even what type of object) it is.
15 Answers
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Haskell error parse error on input `='
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In GHCi 7.x or below, you need a let to define things in it.
Prelude> let f x = x * 2
Prelude> f 4
8
Starting from GHC 8.0.1, top-level bindings are supported in GHCi, so OP's code will work without change.
GHCi, version 8.0.1....
What is & used for
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& is HTML for "Start of a character reference".
& is the character reference for "An ampersand".
&current; is not a standard character reference and so is an error (browsers may try to perform error recovery but you should...
Why Func instead of Predicate?
...on variants come from .net 3.5.
So those Func predicates are used mainly for consistency in the LINQ operators. As of .net 3.5, about using Func<T> and Action<T> the guideline states:
Do use the new LINQ types Func<> and
Expression<> instead of custom
delegates and p...
Two way sync with rsync
...irB/ asks no questions at all, and writes to output how many files were ignored (because they conflicted).
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