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How can I add new array elements at the beginning of an array in Javascript?
...st/last element of an array
A simple diagram...
unshift -> array <- push
shift <- array -> pop
and chart:
add remove start end
push X X
pop X X
unshift X X
shift X X
Check out th...
Removing multiple keys from a dictionary safely
...g from a search engine. If keys are known (when safety is not an issue), multiple keys can be deleted in one line like this del dict['key1'], dict['key2'], dict['key3']
– Tirtha R
May 3 '18 at 23:24
...
Can I zip more than two lists together in Scala?
... favourite functional lib here) route, pattern matching is the way to go, although the (_, _) syntax is a bit awkward with nesting, so let's change it:
import scala.{Tuple2 => &}
for (i1 & i2 & i3 & i4 <- list1 zip list2 zip list3 zip list4) yield (i1, i2, i3, i4)
The &...
Convert Array to Object
...t enumerable.
Also, you can use ES6 spread syntax to achieve the same result:
{ ...['a', 'b', 'c'] }
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Java: function for arrays like PHP's join()?
... It's worth mentioning that String.join() would work only for List<CharSequence> or CharSequence[] elements.
– Enigo
Nov 18 '16 at 7:55
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Emulate ggplot2 default color palette
What function can I use to emulate ggplot2's default color palette for a desired number of colors. For example, an input of 3 would produce a character vector of HEX colors with these colors:
...
Converting String to “Character” array in Java
... a char, and then Java will box it automatically to Character)
get the resulting array by calling toArray()
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Rails has_many with alias name
... you still want to be able to refer to them as tasks as well:
class User < ActiveRecord::Base
alias_attribute :jobs, :tasks
has_many :tasks
end
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Best way to create an empty object in JSON with PHP?
...ution could work..
The documentation specifies that (object) null will result in an empty object, some might therefor say that your code is valid and that it's the method to use.
PHP: Objects - Manual
If a value of any other type is converted to an object, a new instance of the stdClass built-in cl...
Class type check in TypeScript
...d to be of type Any or a subtype of the 'Function' interface type. The result is always of the Boolean primitive type.
So you could use
mySprite instanceof Sprite;
Note that this operator is also in ActionScript but it shouldn't be used there anymore:
The is operator, which is new for ActionScrip...