You misunderstand how boolean expressions work; they don’t work like an English sentence and guess that you are talking about the same comparison for all names here. You are looking for: if x == 1 or y == 1 or z == 1: x and y are otherwise evaluated on their own (False if 0, … Read more
You don’t need to use 4 spaces on your second conditional line. Maybe use: if (cond1 == ‘val1’ and cond2 == ‘val2’ and cond3 == ‘val3’ and cond4 == ‘val4′): do_something Also, don’t forget the whitespace is more flexible than you might think: if ( cond1 == ‘val1’ and cond2 == ‘val2’ and cond3 == … Read more
[[ has fewer surprises and is generally safer to use. But it is not portable – POSIX doesn’t specify what it does and only some shells support it (beside bash, I heard ksh supports it too). For example, you can do [[ -e $b ]] to test whether a file exists. But with [, you … Read more
Angular 4 and 5: Using else: <div *ngIf=”isValid;else other_content”> content here … </div> <ng-template #other_content>other content here…</ng-template> You can also use then else: <div *ngIf=”isValid;then content else other_content”>here is ignored</div> <ng-template #content>content here…</ng-template> <ng-template #other_content>other content here…</ng-template> Or then alone: <div *ngIf=”isValid;then content”></div> <ng-template #content>content here…</ng-template> Demo: Plunker Details: <ng-template>: is Angular’s own implementation of … Read more
That’s more specifically a ternary operator expression than an if-then, here’s the python syntax value_when_true if condition else value_when_false Better Example: (thanks Mr. Burns) ‘Yes’ if fruit == ‘Apple’ else ‘No’ Now with assignment and contrast with if syntax fruit=”Apple” isApple = True if fruit == ‘Apple’ else False vs fruit=”Apple” isApple = False if … Read more
The CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server. SELECT CAST( CASE WHEN Obsolete=”N” or InStock = ‘Y’ THEN 1 ELSE 0 END AS bit) as Saleable, * FROM Product You only need to use the CAST operator if you want the result as a … Read more