Browsing Category: Javascript

While exploring the source code of a TSLint rule, I encountered an interesting syntax: if (node.parent!.kind === ts.SyntaxKind.ObjectLiteralExpression) { return; } The ! operator after node.parent caught my attention. What does it do? Investigating the ! Operator At first, I attempted to compile the file using my existing TypeScript version (1.5.3). This resulted in an error pointing directly to the exclamation mark: $ tsc --noImplicitAny memberAccessRule.ts noPublicModifierRule.ts(57,24): error TS1005: ')' expected. Realizing…

Understanding JavaScript’s == vs ===: Why Strict Equality Wins JavaScript has two equality operators: == (loose equality) and === (strict equality). While they might seem similar at first glance, their behavior can be wildly different. Why Is == So Unpredictable? The == operator doesn’t just check if two values are the same—it tries to convert them to a common type before comparing. This leads to some unexpected and, frankly, weird results. console.log(""…