fix: peek() method in stack.ts

AmiyahJo · AmiyahJo · commit 6175f1b00ed3 · 2024-10-23T14:27:16.000Z
feat: new constant to store the current stack
diff --git a/lesson_12/structs_ts/src/stack.ts b/lesson_12/structs_ts/src/stack.ts
@@ -27,8 +27,8 @@ export class Stack {
     if (this.isEmpty()) {
       return null;
     } 
-
-    return this.top!.val;
+    const currentTop = this.top;
+    return currentTop ? currentTop.val : null;
   }
 
   isEmpty(): boolean {

Original file line number	Diff line number	Diff line change
`@@ -27,8 +27,8 @@ export class Stack {`
`27`	`27`	`if (this.isEmpty()) {`
`28`	`28`	`return null;`
`29`	`29`	`}`
`30`		`-`
`31`		`- return this.top!.val;`
	`30`	`+ const currentTop = this.top;`
	`31`	`+ return currentTop ? currentTop.val : null;`
`32`	`32`	`}`
`33`	`33`
`34`	`34`	`isEmpty(): boolean {`