removed unused variable in Doubly linked list and amended insert method #20
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| In the first file, the 'current' variable is missing. |
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append method of doubly linked list had unused current variable - removed same.
in insert method of doubly linked list, for position === 0, we check if its !this.getHead(). however, this.getHead() is already available in current variable, hence instead we can just check !current