You can simply use shell commands. If you want to suppress echoing the output, use the “@” sign. For example: clean: @if [ “test” = “test” ]; then\ echo “Hello world”;\ fi Note that the closing ; and \ at each line are necessary (This is because make interpret each line as a seperate command … 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
You can indeed place create a block of statements to execute after a conditional. But you have the syntax wrong. The parentheses must be used exactly as shown: if <statement> ( do something ) else ( do something else ) However, I do not believe that there is any built-in syntax for else-if statements. You … 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
Hereunder three syntax options for that kind of statement. From gitlab-ci documentation : Using shell variable deploy-dev: image: testimage environment: dev tags: – kubectl script: – if [ “$flag” == “true” ]; then MODULE=”demo1″; else MODULE=”demo2″; fi – kubectl apply -f ${MODULE} –record=true Using shell variable with yaml multiline block deploy-dev: image: testimage environment: dev … Read more
Your first step in these kinds of problems is always to make a logic table. A | B | Result ——————- T | T | do action C T | F | … F | T | do action C F | F | do action C Once you’ve made the table, the solution is … Read more
Update for Swift 3: The following will work in Swift 3: if let latitudeDouble = latitude as? Double, let longitudeDouble = longitude as? Double { // latitudeDouble and longitudeDouble are non-optional in here } Just be sure to remember that if one of the attempted optional bindings fail, the code inside the if-let block won’t … 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
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
If you cannot come up with a formula, you can use a table for such a limited number of outcomes: final int[][] result = new int[][] { { 0, 0, 1, 2 }, { 0, 0, 2, 1 }, { 2, 1, 3, 3 }, { 1, 2, 3, 3 } }; return result[one][two];