Web Reference: Learn about boolean data type in TypeScript. Boolean values are supported by both JavaScript and TypeScript and stored as true/false values. In TypeScript, you can declare a boolean variable using the boolean keyword. For example: // after a while // .. To manipulate boolean values, you use the boolean operators. TypeScript supports common boolean operators: For example: const notPending = !pending; // false console.log(result); // false const hasError: boolean = false; JavaScript has three very commonly used primitives: string, number, and boolean. Each has a corresponding type in TypeScript. As you might expect, these are the same names you’d see if you used the JavaScript typeof operator on a value of those types: number is for numbers like 42.
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