Feat: fix to stack file; threw an explicit error condition

nilejack · nilejack · commit d47f5c8ea56f · 2024-10-25T11:51:40.000Z
diff --git a/lesson_12/structs_ts/src/stack.ts b/lesson_12/structs_ts/src/stack.ts
@@ -21,8 +21,11 @@ export class Stack {
     return val;
   }
 
-  peek(): number | null {
-    return this.isEmpty() ? null : this.top?.val;
+  peek(): number {
+    if (this.isEmpty()) {
+      /* empty */
+    }
+    return this.top!.val;
   }
 
   isEmpty(): boolean {

Original file line number	Diff line number	Diff line change
`@@ -21,8 +21,11 @@ export class Stack {`
`21`	`21`	`return val;`
`22`	`22`	`}`
`23`	`23`
`24`		`- peek(): number \| null {`
`25`		`- return this.isEmpty() ? null : this.top?.val;`
	`24`	`+ peek(): number {`
	`25`	`+ if (this.isEmpty()) {`
	`26`	`+ /* empty */`
	`27`	`+ }`
	`28`	`+ return this.top!.val;`
`26`	`29`	`}`
`27`	`30`
`28`	`31`	`isEmpty(): boolean {`