fix the error about assignment to constant
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@ -22,7 +22,7 @@ class ListNode {
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*/
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arrToLinkedList(arr) {
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const dum = new ListNode(0);
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const head = dum;
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let head = dum;
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for (const val of arr) {
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head.next = new ListNode(val);
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head = head.next;
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