The reason for this result can be found in documentation of function strtol which is used first on using the comparison operators EQU, NEQ, LSS, LEQ, GTR, GEQ as explained in my answer on Symbol equivalent to NEQ, LSS, GTR, etc. in Windows batch files. Return Value On success, the function returns the converted integral … Read more
IIf is not an operator or a language construct, it’s a function, just like any other function such as Left. It will therefore evaluate all its arguments at all times, whereas with If you will only evaluate the correct branch. Example: denominator = 0 value = IIf(denominator = 0, 0, value / denominator) This will … Read more
If both sides of an IF comparison are composed strictly of decimal digits, then IF will interpret both sides as numbers. This is what enables IF to correctly determine that 10 is greater than 9. If you have any non digit characters, then IF does a string comparison. For example, “10” is less than “9” … Read more
Essentially the line is saying, “if you can let the new variable name equal the non-optional version of optionalName, do the following with it”. As Martin pointed out, this is called Optional Binding. The sole purpose of it is to test if an optional variable contains an actual value and bind the non-optional form to … Read more
A switch construct is more easily translated into a jump (or branch) table. This can make switch statements much more efficient than if-else when the case labels are close together. The idea is to place a bunch of jump instructions sequentially in memory and then add the value to the program counter. This replaces a … Read more
You can use the “pattern-match” operator ~=: if 200 … 299 ~= statusCode { print(“success”) } Or a switch-statement with an expression pattern (which uses the pattern-match operator internally): switch statusCode { case 200 … 299: print(“success”) default: print(“failure”) } Note that ..< denotes a range that omits the upper value, so you probably want … Read more
At the very lowest level (in the hardware), yes, ifs are expensive. In order to understand why, you have to understand how pipelines work. The current instruction to be executed is stored in something typically called the instruction pointer (IP) or program counter (PC); these terms are synonymous, but different terms are used with different … Read more
The problem with the first version is that if you go back and add a second statement to the if or else clauses without remembering to add the curly braces, your code will break in unexpected and amusing ways. Maintainability-wise, it’s always smarter to use the second form. EDIT: Ned points this out in the … Read more
Angularjs (versions below 1.1.5) does not provide the if/else functionality . Following are a few options to consider for what you want to achieve: (Jump to the update below (#5) if you are using version 1.1.5 or greater) 1. Ternary operator: As suggested by @Kirk in the comments, the cleanest way of doing this would … Read more