or-operator
Switch statement using or
This way: switch(menuChoice) { case ‘q’: case ‘Q’: //Some code break; case ‘s’: case ‘S’: //More code break; default: } More on that topic: http://en.wikipedia.org/wiki/Switch_statement#C.2C_C.2B.2B.2C_Java.2C_PHP.2C_ActionScript.2C_JavaScript
The behaviour of the or operator in PHP
The basics: An assignment expression results in the assigned value. What does that mean? $foo = ‘bar’ is an expression, in which the assignment operator = assigns a value. An expression always returns a value itself. Just like the expression 1 + 2 results in the value 3, the expression $foo = ‘bar’ results in … Read more
Angular 2 ngSwitchCase, OR operator not working
If you evaluate ‘d’ || ‘e’ || ‘f’ the result is ‘d’ and when options is not ‘d’, then it doesn’t match. You can’t use ngSwitchCase that way. This would work: <ng-container [ngSwitch]=”true”> <ng-container *ngSwitchCase=”options === ‘a'”>Code A</ng-container> <ng-container *ngSwitchCase=”options === ‘b'”>Code B</ng-container> <ng-container *ngSwitchCase=”options === ‘c'”>Code C</ng-container> <ng-container *ngSwitchCase=”options === ‘d’ || options === … Read more
Shortcut “or-assignment” (|=) operator in Java
The |= is a compound assignment operator (JLS 15.26.2) for the boolean logical operator | (JLS 15.22.2); not to be confused with the conditional-or || (JLS 15.24). There are also &= and ^= corresponding to the compound assignment version of the boolean logical & and ^ respectively. In other words, for boolean b1, b2, these … Read more
What does “var FOO = FOO || {}” (assign a variable or an empty object to that variable) mean in Javascript?
Your guess as to the intent of || {} is pretty close. This particular pattern when seen at the top of files is used to create a namespace, i.e. a named object under which functions and variables can be created without unduly polluting the global object. The reason why it’s used is so that if … Read more
Logical Operators, || or OR?
There is no “better” but the more common one is ||. They have different precedence and || would work like one would expect normally. See also: Logical operators (the following example is taken from there): // The result of the expression (false || true) is assigned to $e // Acts like: ($e = (false || … Read more
What does the construct x = x || y mean?
What is the double pipe operator (||)? The double pipe operator (||) is the logical OR operator . In most languages it works the following way: If the first value is false, it checks the second value. If that’s true, it returns true and if the second value is false, it returns false. If the … Read more
Boolean operators && and ||
The shorter ones are vectorized, meaning they can return a vector, like this: ((-2:2) >= 0) & ((-2:2) <= 0) # [1] FALSE FALSE TRUE FALSE FALSE The longer form evaluates left to right examining only the first element of each vector, so the above gives ((-2:2) >= 0) && ((-2:2) <= 0) # [1] … Read more