Add solution 04 - Optional Parameter <name>?:

echoEscape · echoEscape · commit 1447f86c596e · 2023-12-22T07:33:37.000+01:00
diff --git a/src/04-optional-params.problem.ts b/src/04-optional-params.problem.ts
@@ -1,6 +1,6 @@
 import { expect, it } from "vitest";
 
-export const getName = (first: string, last: string) => {
+export const getName = (first: string, last?: string) => {
   if (last) {
     return `${first} ${last}`;
   }

Original file line number	Diff line number	Diff line change
`@@ -1,6 +1,6 @@`
`1`	`1`	`import { expect, it } from "vitest";`
`2`	`2`
`3`		`-export const getName = (first: string, last: string) => {`
	`3`	`+export const getName = (first: string, last?: string) => {`
`4`	`4`	`if (last) {`
`5`	`5`	return `${first} ${last}`;
`6`	`6`	`}`