Created
March 13, 2021 03:45
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function Node( data ) { | |
this.data = data; | |
this.next = null; | |
} | |
class SinglyLinkedList { | |
constructor() { | |
this.head = null; | |
this.tail = null; | |
this.numberOfValues = 0; | |
} | |
add(data) { | |
let node = new Node( data ); | |
if ( !this.head ) { | |
this.head = node; | |
this.tail = node; | |
} else { | |
this.tail.next = node; | |
this.tail = node; | |
} | |
this.numberOfValues++; | |
} | |
remove(data) { | |
let previous = this.head; | |
let current = this.head; | |
while ( current ) { | |
if ( current.data === data ) { | |
if ( current === this.head ) { | |
this.head = this.head.next; | |
} | |
if ( current === this.tail ) { | |
this.tail = previous; | |
} | |
previous.next = current.next; | |
this.numberOfValues--; | |
} else { | |
previous = current; | |
} | |
current = current.next; | |
} | |
} | |
insertAfter(data, toNodeData) { | |
let current = this.head; | |
while ( current ) { | |
if ( current.data === toNodeData ) { | |
let node = new Node( data ); | |
if ( current === this.tail ) { | |
this.tail.next = node; | |
this.tail = node; | |
} else { | |
node.next = current.next; | |
current.next = node; | |
} | |
this.numberOfValues++; | |
} | |
current = current.next; | |
} | |
} | |
traverse(fn) { | |
let current = this.head; | |
while ( current ) { | |
if ( fn ) { | |
fn( current ); | |
} | |
current = current.next; | |
} | |
} | |
length() { | |
return this.numberOfValues; | |
} | |
print() { | |
let string = ''; | |
let current = this.head; | |
while ( current ) { | |
string += current.data + ' '; | |
current = current.next; | |
} | |
console.log( string.trim() ); | |
} | |
} | |
let singlyLinkedList = new SinglyLinkedList(); | |
singlyLinkedList.print(); // => '' | |
singlyLinkedList.add( 1 ); | |
singlyLinkedList.add( 2 ); | |
singlyLinkedList.add( 3 ); | |
singlyLinkedList.add( 4 ); | |
singlyLinkedList.print(); // => 1 2 3 4 | |
console.log( 'length is 4:', singlyLinkedList.length() ); // => 4 | |
singlyLinkedList.remove( 3 ); // remove value | |
singlyLinkedList.print(); // => 1 2 4 | |
singlyLinkedList.remove( 9 ); // remove non existing value | |
singlyLinkedList.print(); // => 1 2 4 | |
singlyLinkedList.remove( 1 ); // remove head | |
singlyLinkedList.print(); // => 2 4 | |
singlyLinkedList.remove( 4 ); // remove tail | |
singlyLinkedList.print(); // => 2 | |
console.log( 'length is 1:', singlyLinkedList.length() ); // => 1 | |
singlyLinkedList.add( 6 ); | |
singlyLinkedList.print(); // => 2 6 | |
singlyLinkedList.insertAfter( 3, 2 ); | |
singlyLinkedList.print(); // => 2 3 6 | |
singlyLinkedList.insertAfter( 4, 3 ); | |
singlyLinkedList.print(); // => 2 3 4 6 | |
singlyLinkedList.insertAfter( 5, 9 ); // insertAfter a non existing node | |
singlyLinkedList.print(); // => 2 3 4 6 | |
singlyLinkedList.insertAfter( 5, 4 ); | |
singlyLinkedList.insertAfter( 7, 6 ); // insertAfter the tail | |
singlyLinkedList.print(); // => 2 3 4 5 6 7 | |
singlyLinkedList.add( 8 ); // add node with normal method | |
singlyLinkedList.print(); // => 2 3 4 5 6 7 8 | |
console.log( 'length is 7:', singlyLinkedList.length() ); // => 7 | |
singlyLinkedList.traverse( node => { | |
node.data = node.data + 10; | |
} ); | |
singlyLinkedList.print(); // => 12 13 14 15 16 17 18 | |
singlyLinkedList.traverse( node => { | |
console.log( node.data ); | |
} ); // => 12 13 14 15 16 17 18 | |
console.log( 'length is 7:', singlyLinkedList.length() ); // => 7 |
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