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Use exist method to be consistent with Stack (#708)

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H2rmone 2022-01-28 03:36:39 +08:00 committed by GitHub
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commit 8e8f28ffcf
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src/data-structures/queue/Queue.js
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@ -21,7 +21,7 @@ export default class Queue {
* @return {*} * @return {*}
*/ */
peek() { peek() {
if (!this.linkedList.head) { if (this.isEmpty()) {
return null; return null;
} }