One way to achieve this with TF 0.12 onwards is to use dynamic blocks: dynamic “access_logs” { for_each = var.environment_name == “production” ? [var.environment_name] : [] content { bucket = “my-bucket” prefix = “${var.environment_name}-alb” } } This will create one or zero access_logs blocks depending on the value of var.environment_name.
Yes, potentially. Consider this (C#, Java, whatever): int x = GetValueFromSomewhere(); if (x == 0) { // Something x = 1; } else if (x == 1) { // Something else… } vs this: int x = GetValueFromSomewhere(); if (x == 0) { // Something x = 1; } if (x == 1) { // … Read more
The {{#if}} helper can only test for properties, not arbitrary expressions. The best thing to do in cases like this is therefore to write a property computing whatever conditional you want to test for. personIsJohn: function() { return this.get(‘person’) === ‘John’; }.property(‘person’) Then do {{#if personIsJohn}}. Note: If you find this too limiting, you can … Read more
That’s because the value of the option is stored in the cache (CMakeCache.txt). If you change the default value in the CMakeLists but the actual value is already stored in the cache, it will just load the value from the cache. So to test the logic in your CMakeLists, delete the cache each time before … Read more
There are two forms of switch in CoffeeScript: switch expr when expr1 then … when expr2 then … … else … and: switch when expr1 then … when expr2 then … … else … The second form might help you: view = switch when target.hasClass ‘red’ then new App.RedView when target.hasClass ‘blue’ then new App.BlueView … 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
Use the function not: {{ if not .loggedIn }} <h1>Not logged in</h1> {{ end }}
From the Sass language reference documentation: Boolean Operations SassScript supports and, or, and not operators for boolean values. (link) So an if statement expression with a compound condition would look like this: @if $var1 == value1 and $var2 == value2 { // … } Further, parentheses can be used to affect the order of operations … Read more
If your requirement was simply empty or null (like mine when I saw this title in a search result), you can use Dart’s safe navigation operator to make it a bit more terse: if (routeinfo[“no_route”]?.isEmpty ?? true) { // } Where isEmpty checks for an empty String, but if routeinfo is null you can’t call … Read more
I prefer Option A bool a, b, c; if( a && b && c ) { //This is neat & readable } If you do have particularly long variables/method conditions you can just line break them if( VeryLongConditionMethod(a) && VeryLongConditionMethod(b) && VeryLongConditionMethod(c)) { //This is still readable } If they’re even more complicated, then I’d … Read more