Created
March 24, 2022 07:32
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| class QueueStack { | |
| constructor() { | |
| this.q = []; | |
| } | |
| push(val) { | |
| let size = this.q.length; | |
| this.q.push(val); | |
| while (size--) { | |
| this.q.push(this.q.shift()); | |
| } | |
| } | |
| pop() { | |
| if (!this.q.length) return null; | |
| return this.q.shift(); | |
| } | |
| peek() { | |
| if (!this.q.length) return null; | |
| return this.q[0]; | |
| } | |
| isEmpty() { | |
| return this.q.length === 0 | |
| } | |
| } |
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