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What is an optional value in Swift?
...n:
let leatherTrim: CarExtras? = nil
if leatherTrim {
price = price + 1000
}
In more recent versions of Swift you have to use leatherTrim != nil. Why is this? The problem is that a Boolean can be wrapped in an optional. If you have Boolean like this:
var ambiguous: Boolean? = false
it has two ...
In what situations would AJAX long/short polling be preferred over HTML5 WebSockets?
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509
WebSockets is definitely the future.
Long polling is a dirty workaround to prevent creating co...
Single quotes vs. double quotes in Python [closed]
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answered Sep 11 '08 at 10:06
Will HarrisWill Harris
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What is the difference between “git init” and “git init --bare”?
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edited Sep 7 '18 at 0:12
Alex - GlassEditor.com
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When to choose checked and unchecked exceptions
...on?
– ivanjermakov
Oct 26 '19 at 4:50
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Single Page Application: advantages and disadvantages [closed]
... many mails some reads when he/she opens his/her mail account. I read >50 at one go. now the structure of the mails is almost the same. if you will use a server side rendering scheme the server would then render it on every request(typical case).
- security concern - you should/ should not k...
Do DOM tree elements with ids become global variables?
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407
What is supposed to happen is that ‘named elements’ are added as apparent properties of the...
Differences between Octave and MATLAB? [closed]
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answered Aug 23 '12 at 4:08
Rody OldenhuisRody Oldenhuis
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What is a NullPointerException, and how do I fix it?
...owing code where you declare a variable of primitive type int:
int x;
x = 10;
In this example, the variable x is an int and Java will initialize it to 0 for you. When you assign it the value of 10 on the second line, your value of 10 is written into the memory location referred to by x.
But, when y...