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Merge branch 'master' into improve-bubble-sort

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Albert Still 2018-05-24 16:12:13 +10:00 committed by GitHub
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src/data-structures/stack/Stack.js
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@ -16,7 +16,7 @@ export default class Stack {
* @return {*}
*/
peek() {
if (!this.linkedList.tail) {
if (this.isEmpty()) {
return null;
}