To answer this question, we’ll examine the assembly code produced by the X86 and X64 JITs for each of these cases. X86, if/then 32: foreach (int i in array) 0000007c 33 D2 xor edx,edx 0000007e 83 7E 04 00 cmp dword ptr [esi+4],0 00000082 7E 1C jle 000000A0 00000084 8B 44 96 08 mov eax,dword … Read more
The syntax you’re looking for: lambda x: True if x % 2 == 0 else False But you can’t use print or raise in a lambda.
The compiler does not infer the type of the result of the conditional operator from the usage of the result, but from the types of its arguments. The compiler fails when it sees this expression because it cannot deduce the type of the result: IsDateTimeHappy(myDateTime) ? null : myDateTime; Since null and DateTime are not … Read more
When your first argument is null, they’re basically the same except that the null coalescing won’t output an E_NOTICE when you have an undefined variable. The PHP 7.0 migration docs has this to say: The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary … Read more
You are running the [ (aka test) command with the argument “false”, not running the command false. Since “false” is a non-empty string, the test command always succeeds. To actually run the command, drop the [ command. if false; then echo “True” else echo “False” fi
var startingNumber = startingNumber || 1; Something like that what you’re looking for, where it defaults if undefined? var foo = bar || 1; // 1 var bar = 2; foo = bar || 1; // 2 By the way, this works for a lot of scenarios, including objects: var foo = bar || {}; … Read more
The syntax would be: var icon = (area == 1) ? icon1 : (area == 2) ? icon2 : icon0; But this is starting to get complicated. You may well be better off just creating a function to do this work instead: var icon = getIcon(area); function getIcon(area) { if (area == 1) { return … Read more
As pointed out (and hopefully unsurprisingly), using if+else is indeed the idiomatic way to do conditionals in Go. In addition to the full blown var+if+else block of code, though, this spelling is also used often: index := val if val <= 0 { index = -val } and if you have a block of code … Read more
One problem is that a ternary relational construct would introduce serious parser problems: <expr> ::= <expr> <rel-op> <expr> | … | <expr> <rel-op> <expr> <rel-op> <expr> When you try to express a grammar with those productions using a typical PGS, you’ll find that there is a shift-reduce conflict at the point of the first <rel-op>. … Read more
Well, the ternary operator in Java acts like this… return_value = (true-false condition) ? (if true expression) : (if false expression); …Another way of looking at it… return_value = (true-false condition) ? (if true expression) : (if false expression); You question is kind of vague and we have to assume here. If (and only if) … Read more