ngx-bootstrap
Version:
Angular Bootstrap
247 lines • 25.8 kB
JavaScript
export class LinkedList {
constructor() {
this.length = 0;
this.asArray = [];
// Array methods overriding END
}
get(position) {
if (this.length === 0 || position < 0 || position >= this.length) {
return void 0;
}
let current = this.head;
for (let index = 0; index < position; index++) {
current = current?.next;
}
return current?.value;
}
add(value, position = this.length) {
if (position < 0 || position > this.length) {
throw new Error('Position is out of the list');
}
const node = {
value,
next: undefined,
previous: undefined
};
if (this.length === 0) {
this.head = node;
this.tail = node;
this.current = node;
}
else {
if (position === 0 && this.head) {
// first node
node.next = this.head;
this.head.previous = node;
this.head = node;
}
else if (position === this.length && this.tail) {
// last node
this.tail.next = node;
node.previous = this.tail;
this.tail = node;
}
else {
// node in middle
const currentPreviousNode = this.getNode(position - 1);
const currentNextNode = currentPreviousNode?.next;
if (currentPreviousNode && currentNextNode) {
currentPreviousNode.next = node;
currentNextNode.previous = node;
node.previous = currentPreviousNode;
node.next = currentNextNode;
}
}
}
this.length++;
this.createInternalArrayRepresentation();
}
remove(position = 0) {
if (this.length === 0 || position < 0 || position >= this.length) {
throw new Error('Position is out of the list');
}
if (position === 0 && this.head) {
// first node
this.head = this.head.next;
if (this.head) {
// there is no second node
this.head.previous = undefined;
}
else {
// there is no second node
this.tail = undefined;
}
}
else if (position === this.length - 1 && this.tail?.previous) {
// last node
this.tail = this.tail.previous;
this.tail.next = undefined;
}
else {
// middle node
const removedNode = this.getNode(position);
if (removedNode?.next && removedNode.previous) {
removedNode.next.previous = removedNode.previous;
removedNode.previous.next = removedNode.next;
}
}
this.length--;
this.createInternalArrayRepresentation();
}
set(position, value) {
if (this.length === 0 || position < 0 || position >= this.length) {
throw new Error('Position is out of the list');
}
const node = this.getNode(position);
if (node) {
node.value = value;
this.createInternalArrayRepresentation();
}
}
toArray() {
return this.asArray;
}
findAll(fn) {
let current = this.head;
const result = [];
if (!current) {
return result;
}
for (let index = 0; index < this.length; index++) {
if (!current) {
return result;
}
if (fn(current.value, index)) {
result.push({ index, value: current.value });
}
current = current.next;
}
return result;
}
// Array methods overriding start
push(...args) {
args.forEach((arg) => {
this.add(arg);
});
return this.length;
}
pop() {
if (this.length === 0) {
return undefined;
}
const last = this.tail;
this.remove(this.length - 1);
return last?.value;
}
unshift(...args) {
args.reverse();
args.forEach((arg) => {
this.add(arg, 0);
});
return this.length;
}
shift() {
if (this.length === 0) {
return undefined;
}
const lastItem = this.head?.value;
this.remove();
return lastItem;
}
forEach(fn) {
let current = this.head;
for (let index = 0; index < this.length; index++) {
if (!current) {
return;
}
fn(current.value, index);
current = current.next;
}
}
indexOf(value) {
let current = this.head;
let position = -1;
for (let index = 0; index < this.length; index++) {
if (!current) {
return position;
}
if (current.value === value) {
position = index;
break;
}
current = current.next;
}
return position;
}
some(fn) {
let current = this.head;
let result = false;
while (current && !result) {
if (fn(current.value)) {
result = true;
break;
}
current = current.next;
}
return result;
}
every(fn) {
let current = this.head;
let result = true;
while (current && result) {
if (!fn(current.value)) {
result = false;
}
current = current.next;
}
return result;
}
toString() {
return '[Linked List]';
}
find(fn) {
let current = this.head;
for (let index = 0; index < this.length; index++) {
if (!current) {
return;
}
if (fn(current.value, index)) {
return current.value;
}
current = current.next;
}
}
findIndex(fn) {
let current = this.head;
for (let index = 0; index < this.length; index++) {
if (!current) {
return -1;
}
if (fn(current.value, index)) {
return index;
}
current = current.next;
}
return -1;
}
getNode(position) {
if (this.length === 0 || position < 0 || position >= this.length) {
throw new Error('Position is out of the list');
}
let current = this.head;
for (let index = 0; index < position; index++) {
current = current?.next;
}
return current;
}
createInternalArrayRepresentation() {
const outArray = [];
let current = this.head;
while (current) {
outArray.push(current.value);
current = current.next;
}
this.asArray = outArray;
}
}
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ListNode<T> {\n  value: T,\n  next?: ListNode<T>,\n  previous?: ListNode<T>\n}\n\nexport class LinkedList<T> {\n  length = 0;\n  protected head?: ListNode<T>;\n  protected tail?: ListNode<T>;\n  protected current?: ListNode<T>;\n  protected asArray: T[] = [];\n\n  get(position: number): T | undefined {\n    if (this.length === 0 || position < 0 || position >= this.length) {\n      return void 0;\n    }\n\n    let current = this.head;\n\n    for (let index = 0; index < position; index++) {\n      current = current?.next;\n    }\n\n    return current?.value;\n  }\n\n  add(value: T, position: number = this.length): void {\n    if (position < 0 || position > this.length) {\n      throw new Error('Position is out of the list');\n    }\n\n    const node: ListNode<T> = {\n      value,\n      next: undefined,\n      previous: undefined\n    };\n\n    if (this.length === 0) {\n      this.head = node;\n      this.tail = node;\n      this.current = node;\n    } else {\n      if (position === 0 && this.head) {\n        // first node\n        node.next = this.head;\n        this.head.previous = node;\n        this.head = node;\n      } else if (position === this.length && this.tail) {\n        // last node\n        this.tail.next = node;\n        node.previous = this.tail;\n        this.tail = node;\n      } else {\n        // node in middle\n        const currentPreviousNode = this.getNode(position - 1);\n        const currentNextNode = currentPreviousNode?.next;\n        if (currentPreviousNode && currentNextNode) {\n          currentPreviousNode.next = node;\n          currentNextNode.previous = node;\n          node.previous = currentPreviousNode;\n          node.next = currentNextNode;\n        }\n      }\n    }\n    this.length++;\n    this.createInternalArrayRepresentation();\n  }\n\n  remove(position = 0): void {\n    if (this.length === 0 || position < 0 || position >= this.length) {\n      throw new Error('Position is out of the list');\n    }\n\n    if (position === 0 && this.head) {\n      // first node\n      this.head = this.head.next;\n\n      if (this.head) {\n        // there is no second node\n        this.head.previous = undefined;\n      } else {\n        // there is no second node\n        this.tail = undefined;\n      }\n    } else if (position === this.length - 1 && this.tail?.previous) {\n      // last node\n      this.tail = this.tail.previous;\n      this.tail.next = undefined;\n    } else {\n      // middle node\n      const removedNode = this.getNode(position);\n      if (removedNode?.next && removedNode.previous) {\n        removedNode.next.previous = removedNode.previous;\n        removedNode.previous.next = removedNode.next;\n      }\n    }\n\n    this.length--;\n    this.createInternalArrayRepresentation();\n  }\n\n  set(position: number, value: T): void {\n    if (this.length === 0 || position < 0 || position >= this.length) {\n      throw new Error('Position is out of the list');\n    }\n\n    const node = this.getNode(position);\n    if (node) {\n      node.value = value;\n      this.createInternalArrayRepresentation();\n    }\n  }\n\n  toArray(): T[] {\n    return this.asArray;\n  }\n\n  findAll(fn: (value: T, index: number) => boolean): { index: number, value: T }[] {\n    let current = this.head;\n    const result: { index: number, value: T }[] = [];\n\n    if (!current) {\n      return result;\n    }\n\n    for (let index = 0; index < this.length; index++) {\n      if (!current) {\n        return result;\n      }\n      if (fn(current.value, index)) {\n        result.push({ index, value: current.value });\n      }\n      current = current.next;\n\n    }\n\n    return result;\n  }\n\n  // Array methods overriding start\n  push(...args: T[]): number {\n    args.forEach((arg: T) => {\n      this.add(arg);\n    });\n\n    return this.length;\n  }\n\n  pop(): T | undefined {\n    if (this.length === 0) {\n      return undefined;\n    }\n    const last = this.tail;\n    this.remove(this.length - 1);\n\n    return last?.value;\n  }\n\n  unshift(...args: T[]): number {\n    args.reverse();\n    args.forEach((arg: T) => {\n      this.add(arg, 0);\n    });\n\n    return this.length;\n  }\n\n  shift(): T | undefined {\n    if (this.length === 0) {\n      return undefined;\n    }\n    const lastItem = this.head?.value;\n    this.remove();\n\n    return lastItem;\n  }\n\n  forEach(fn: (value: T, index: number) => void): void {\n    let current = this.head;\n    for (let index = 0; index < this.length; index++) {\n      if (!current) {\n        return;\n      }\n      fn(current.value, index);\n      current = current.next;\n    }\n  }\n\n  indexOf(value: T): number {\n    let current = this.head;\n    let position = -1;\n\n    for (let index = 0; index < this.length; index++) {\n      if (!current) {\n        return position;\n      }\n      if (current.value === value) {\n        position = index;\n        break;\n      }\n      current = current.next;\n    }\n\n    return position;\n  }\n\n  some(fn: (value: T) => boolean): boolean {\n    let current = this.head;\n    let result = false;\n    while (current && !result) {\n      if (fn(current.value)) {\n        result = true;\n        break;\n      }\n      current = current.next;\n    }\n\n    return result;\n  }\n\n  every(fn: (value: T) => boolean): boolean {\n    let current = this.head;\n    let result = true;\n    while (current && result) {\n      if (!fn(current.value)) {\n        result = false;\n      }\n      current = current.next;\n    }\n\n    return result;\n  }\n\n  toString(): string {\n    return '[Linked List]';\n  }\n\n  find(fn: (value: T, index: number) => boolean): T | void {\n    let current = this.head;\n    for (let index = 0; index < this.length; index++) {\n      if (!current) {\n        return;\n      }\n      if (fn(current.value, index)) {\n        return current.value;\n      }\n      current = current.next;\n    }\n  }\n\n  findIndex(fn: (value: T, index: number) => boolean): number {\n    let current = this.head;\n    for (let index = 0; index < this.length; index++) {\n      if (!current) {\n        return -1;\n      }\n\n      if (fn(current.value, index)) {\n        return index;\n      }\n\n      current = current.next;\n    }\n\n    return -1;\n  }\n\n  protected getNode(position: number): ListNode<T>|undefined {\n    if (this.length === 0 || position < 0 || position >= this.length) {\n      throw new Error('Position is out of the list');\n    }\n\n    let current = this.head;\n\n    for (let index = 0; index < position; index++) {\n      current = current?.next;\n    }\n\n    return current;\n  }\n\n  protected createInternalArrayRepresentation(): void {\n    const outArray: T[] = [];\n    let current = this.head;\n\n    while (current) {\n      outArray.push(current.value);\n      current = current.next;\n    }\n    this.asArray = outArray;\n  }\n\n  // Array methods overriding END\n}\n"]}