Let’s look at the simple Java code in the following snippet: public class Main { private int temp() { return true ? null : 0; // No compiler error – the compiler allows a return value of null // in a method signature that returns an int. } private int same() { if (true) { … Read more
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Can we use elif in list comprehension? Example : l = [1, 2, 3, 4, 5] for values in l: if values==1: print ‘yes’ elif values==2: print ‘no’ else: print ‘idle’ Can we include the elif in our list comprehension, in a similar fashion to the code above? For example, an answer like: [‘yes’, ‘no’, … Read more
Why does the first return a reference? int x = 1; int y = 2; (x > y ? x : y) = 100; While the second does not? int x = 1; long y = 2; (x > y ? x : y) = 100; Actually, the second did not compile at all – … Read more
Why does the following output True? #!/bin/sh if [ false ]; then echo “True” else echo “False” fi This will always output True even though the condition would seem to indicate otherwise. If I remove the brackets [] then it works, but I do not understand why. 6 Answers 6
It’s more about python list comprehension syntax. I’ve got a list comprehension that produces list of odd numbers of a given range: [x for x in range(1, 10) if x % 2] This makes a filter – I’ve got a source list, where I remove even numbers (if x % 2). I’d like to use … Read more
Say I have this: {% if files %} Update {% else %} Continue {% endif %} In PHP, say, I can write a shorthand conditional, like: <?php echo $foo ? ‘yes’ : ‘no’; ?> Is there then a way I can translate this to work in a jinja2 template: ‘yes’ if foo else ‘no’ 2 … Read more
I read everywhere that ternary operator is supposed to be faster than, or at least the same as, its equivalent if–else block. However, I did the following test and found out it’s not the case: Random r = new Random(); int[] array = new int[20000000]; for(int i = 0; i < array.Length; i++) { array[i] … Read more
I came across the following line hsb.s = max != 0 ? 255 * delta / max : 0; What do the ? and : mean in this context? 8 Answers 8
This question already has answers here: Conditional operator assignment with Nullable<value> types? (6 answers) Why doesn’t this C# code compile? (4 answers) Closed 9 years ago. I just came across a weird error: private bool GetBoolValue() { //Do some logic and return true or false } Then, in another method, something like this: int? x … Read more
