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Extracting the last n characters from a string in R
...derneath but has a default end value of 1,000,000.
Examples:
> RIGHT('Hello World!',2)
[1] "d!"
> RIGHT('Hello World!',8)
[1] "o World!"
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How do I escape a single quote ( ' ) in JavaScript? [duplicate]
...his if i write <input type = "button" value ="pressme" onclick= 'alert('hello')' > is not working but if i change it to "alert('hello')" then it does why so?
– Suraj Jain
Jan 22 '17 at 7:42
...
Objective-C for Windows
...sure that the bin folder of GNUstep MSYS is in your PATH)
Use this simple "Hello World" program to test GNUstep's functionality:
#include <Foundation/Foundation.h>
int main(void)
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSLog(@"Hello World!.");
[pool drain];...
How to do a logical OR operation in shell scripting
...d work:
#!/bin/bash
if [ "$#" -eq 0 ] || [ "$#" -gt 1 ] ; then
echo "hello"
fi
I'm not sure if this is different in other shells but if you wish to use <, >, you need to put them inside double parenthesis like so:
if (("$#" > 1))
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What does the slash mean in help() output?
...
Following function calls are valid
foo(40, 20, 99, 39)
foo(40, 3.14, "hello", y="world")
foo(1.45, 3.14, x="hello", y="world")
But, following function call is not valid which raises an exception TypeError since a, b are not passed as positional arguments instead passed as keyword
foo(a=1.45,...
Regex for numbers only
....21
76876876
.32
-894
-923.21
-76876876
-.32
some strings that doesn't:
hello
9bye
hello9bye
888,323
5,434.3
-8,336.09
87078.
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What are the differences between local branch, local tracking branch, remote branch and remote track
...-track <branchname> [<start-point]
Example:
git branch --track hello-kitty origin/hello-kitty
To delete a branch on a remote machine:
git push --delete <remote> <branchname>
To delete all remote-tracking branches that are stale, that is, where the corresponding branches on...
How do I make $.serialize() take into account those disabled :input elements?
...
Use readonly inputs instead of disabled inputs:
<input name='hello_world' type='text' value='hello world' readonly />
This should get picked up by serialize().
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What does the question mark and the colon (?: ternary operator) mean in objective-c?
...than once. For example: [myArray firstObject] ? [myArray firstObject] : @"Hello World"; calls firstObject twice (if firstObject does not return nil), where [myArray firstObject] ?: @"Hello World"; produces the identical result but never calls firstObject more than once.
– nhgr...
How to use double or single brackets, parentheses, curly braces
...d
$ var="abcde"; echo ${var/de/12}
abc12
Use a default value
$ default="hello"; unset var; echo ${var:-$default}
hello
and several more
Also, brace expansions create lists of strings which are typically iterated over in loops:
$ echo f{oo,ee,a}d
food feed fad
$ mv error.log{,.OLD}
(error.log...