typescript optional parameters
// Optional Parameters
sayHello(hello?: string) {
console.log(hello);
}
sayHello(); // Prints 'undefined'
sayHello('world'); // Prints 'world'typescript optional parameters
// Optional Parameters
sayHello(hello?: string) {
console.log(hello);
}
sayHello(); // Prints 'undefined'
sayHello('world'); // Prints 'world'typescript optional parameters
// Default Parameters
sayHello(hello: string = 'hello') {
console.log(hello);
}
sayHello(); // Prints 'hello'
sayHello('world'); // Prints 'world'how to define optional parameter in typescript
function functionName(par1: number, par2?: number) {
}how to make a parameter optional in typescript
// Optional parameter
function foo(x?: number) {
console.log("x : "+ x);
}
foo();
foo(6);typescript make function argument optional
function multiply(a: number, b: number, c?: number): number {
if (typeof c !== 'undefined') {
return a * b * c;
}
return a * b;
}Copyright © 2021 Codeinu
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