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What does map(&:name) mean in Ruby?
...c
proc { |receiver| receiver.send *self }
end
end
# And then...
[ 'Hello', 'Goodbye' ].map &[ :+, ' world!' ]
#=> ["Hello world!", "Goodbye world!"]
Ampersand & works by sending to_proc message on its operand, which, in the above code, is of Array class. And since I defined #to_...
In-place edits with sed on OS X
...
This creates backup files. E.g. sed -i -e 's/hello/hello world/' testfile for me, creates a backup file, testfile-e, in the same dir.
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Const in JavaScript: when to use it and is it necessary?
...s
That is wrong. Mutating a variable is different from reassigning:
var hello = 'world' // assigning
hello = 'bonjour!' // reassigning
With const, you can not do that:
const hello = 'world'
hello = 'bonjour!' // error
But you can mutate your variable:
const marks = [92, 83]
marks.push(95)
c...
How can I show dots (“…”) in a span with hidden overflow?
...substring(0,limit) + dots;
}
return string;
}
call like
add3Dots("Hello World",9);
outputs
Hello Wor...
See it in action here
function add3Dots(string, limit)
{
var dots = "...";
if(string.length > limit)
{
// you can also use substr instead of substring
string = stri...
What's the difference between :: (double colon) and -> (arrow) in PHP?
...ynamic context, ie. when you deal with some instance of some class:
class Hello {
public function say() {
echo 'hello!';
}
}
$h = new Hello();
$h->say();
By the way: I don't think that using Symfony is a good idea when you don't have any OOP experience.
...
Set color of TextView span in Android
...Background Color
SpannableString spannableString = new SpannableString("Hello World!");
BackgroundColorSpan backgroundSpan = new BackgroundColorSpan(Color.YELLOW);
spannableString.setSpan(backgroundSpan, 0, spannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableS...
How can I use goto in Javascript?
...e—the possibilities afforded by goto are endless and you can even make a Hello, world! message to the JavaScript console 538 times, like this:
var i = 0;
[lbl] start:
console.log("Hello, world!");
i++;
if(i < 538) goto start;
You can read more about how goto is implemented, but basically, it d...
JavaScript: Overriding alert()
...nonymous function redefining the "alert"
/* sample code */
alert("Hello World!");
})(myFunkyAlert);
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Reverse a string in Java
I have "Hello World" kept in a String variable named hi .
45 Answers
45
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How to sort the letters in a string alphabetically in Python
...elow, e and d is behind H and W due it's to ASCII value.
>>>a = "Hello World!"
>>>"".join(sorted(a))
' !!HWdellloor'
CORRECT: In order to write the sorted string without changing the case of letter. Use the code:
>>> a = "Hello World!"
>>> "".join(sorted(a,key...