typescript make function argument optional

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showing results for - "typescript make function argument optional"
Gianluca
01 May 2019
1// Optional Parameters
2sayHello(hello?: string) {
3	console.log(hello);
4}
5
6sayHello(); // Prints 'undefined'
7
8sayHello('world'); // Prints 'world'
Mariangel
18 Jul 2019
1// Optional parameter
2function foo(x?: number) {
3    console.log("x : "+ x);
4}
5foo();
6foo(6);
Eleonora
30 Mar 2020
1interface Param {
2    title: string;
3    callback: function;
4}
5
Anton
02 Jan 2021
1
2        
3            
4        
5     function multiply(a: number, b: number, c?: number): number {
6
7    if (typeof c !== 'undefined') {
8        return a * b * c;
9    }
10    return a * b;
11}
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