isString
Checks if the given value is a string.
This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to string.
Signature
typescript
function isString(value: unknown): value is string;Parameters
value(unknown): The value to test if it is string.
Returns
- (
x is string): True if the value is a string, otherwise false.
Examples
typescript
const value1 = 'abc';
const value2 = 123;
const value3 = true;
console.log(isString(value1)); // true
console.log(isString(value2)); // false
console.log(isString(value3)); // false