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What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...ouble quotes around a variable, you tell the shell to treat it as a single word, even if it contains whitespaces:
var="foo bar"
for i in "$var"; do # Expands to 'for i in "foo bar"; do...'
echo $i # so only runs the loop once
done
# foo bar
Contrast that behavior with the following:...
Unicode equivalents for \w and \b in Java regular expressions?
...g punctuation" (usually: underscore). That way, a regex like \w+ matches words like hello , élève , GOÄ_432 or gefräßig .
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Reserved keywords in JavaScript
What JavaScript keywords (function names, variables, etc) are reserved?
8 Answers
8
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Hidden Features of Xcode
...tween autocompletion choices.
Control ⌃. (Control-Period) after a word automatically accepts the first choice from the autocompletion menu. Try typing log then Control ⌃. and you'll get a nice NSLog statement. Press it again to cycle through any choices. To see all the mutable choices, t...
What is the difference between map and flatMap and a good use case for each?
... Array("Roses", "are", "red", "Violets", "are", "blue")
We have multiple words per line, and multiple lines, but we end up with a single output array of words
Just to illustrate that, flatMapping from a collection of lines to a collection of words looks like:
["aa bb cc", "", "dd"] => [["aa",...
How do you do relative time in Rails?
...
Sounds like you're looking for the time_ago_in_words method (or distance_of_time_in_words), from ActiveSupport. Call it like this:
<%= time_ago_in_words(timestamp) %>
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How do I clear/delete the current line in terminal?
... Ctrl+U to clear up to the beginning.
You can use Ctrl+W to delete just a word.
You can also use Ctrl+C to cancel.
If you want to keep the history, you can use Alt+Shift+# to make it a comment.
Bash Emacs Editing Mode Cheat Sheet
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How does “cat
...ell to read input from
the current source until a line
containing only word (with no trailing
blanks) is seen.
All of the lines read up to that point are then used as the
standard input for a command.
The format of here-documents is:
<<[-]word
h...
Convert all first letter to upper case, rest lower for each word
I have a string of text (about 5-6 words mostly) that I need to convert.
11 Answers
11...
Why do Java programmers like to name a variable “clazz”? [closed]
...? Is this some kind of convention ? I think 'clazz' is not even an English word , has no meaning at all , how can so many programmers name a wrong name coincidentally ?
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