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栈的pop和peek操作增加栈为空的判断,提高代码健壮性 #11

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Merged

XPoet merged 1 commit into XPoet:master from fltenwall:master

Oct 19, 2021

Merged

栈的pop和peek操作增加栈为空的判断,提高代码健壮性 #11

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栈的pop和peek操作增加栈为空的判断,提高代码健壮性

fltenwall Sep 28, 2021

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2 changes: 2 additions & 0 deletions src/Stack/stack.js

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -12,11 +12,13 @@ export default class Stack {

		// pop() 出栈操作,从栈中取出元素,并返回取出的那个元素
		pop() {
	if(this.isEmpty()) throw new Error('栈空了');
		return this.items.pop();
		}

		// peek() 查看栈顶元素
		peek() {
	if(this.isEmpty()) throw new Error('栈空了');
		return this.items[this.items.length - 1];
		}

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