Added limitedArray.ts and tests

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@rakh/utils",
-  "version": "2.0.4",
+  "version": "2.0.5",
   "main": "dist/commonjs/index.js",
   "module": "dist/es/index.js",
   "jsnext:main": "dist/es/index.js",

ts-src/index.ts

@@ -9,6 +9,7 @@ export * from './hasOwn';
 export * from './hourFloor';
 export * from './isEmpty';
 export * from './latLong';
+export * from './limitedArray';
 export * from './maybePluralize';
 export * from './once';
 export * from './partOfDay';

ts-src/limitedArray.test.ts

@@ -0,0 +1,68 @@
+import { limitedArray } from './limitedArray';
+
+test('should initialize an empty array', function () {
+  let lArray = new limitedArray();
+
+  expect(lArray.length()).toEqual(0);
+});
+
+test('Add an item to the array', function () {
+  let lArray = new limitedArray();
+
+  lArray.push('bob');
+
+  expect(lArray.length()).toEqual(1);
+});
+
+test('Add items to the array', function () {
+  let lArray = new limitedArray();
+
+  lArray.add([1, 2, 3, 4, 5]);
+
+  expect(lArray.length()).toEqual(5);
+});
+
+test('Add too many items', function () {
+  let lArray = new limitedArray(5);
+  lArray.add([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+
+  expect(lArray.length()).toEqual(5);
+});
+
+test('Change limit', function () {
+  let lArray = new limitedArray();
+
+  lArray.add([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+  lArray.limit(5);
+
+  expect(lArray.length()).toEqual(5);
+});
+
+test('Get items', function () {
+  let lArray = new limitedArray();
+
+  lArray.push('bob');
+  expect(lArray.get()).toEqual(['bob']);
+});
+
+test('Add too many items and get the results', function () {
+  let lArray = new limitedArray(5);
+  lArray.add([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+
+  expect(lArray.get()).toEqual([6, 7, 8, 9, 10]);
+});
+
+test('Add one more', function () {
+  let lArray = new limitedArray(5);
+  lArray.add([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
+  lArray.push(11);
+
+  expect(lArray.get()).toEqual([7, 8, 9, 10, 11]);
+});
+
+
+/*test('Push many', function () {
+  let lArray = new limitedArray(5);
+  lArray.push(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+  expect(lArray.get()).toEqual([6, 7, 8, 9, 10]);
+});*/

ts-src/limitedArray.ts

@@ -0,0 +1,67 @@
+export class limitedArray {
+  _array: any[];
+  _limit: number;
+
+  /**
+   * Used to construct the LimitedArray
+   * Defaults to 100 when no size is passed in
+   * @param size
+   */
+  constructor(size = 100) {
+    this._array = [];
+    this._limit = size;
+  }
+
+  /**
+   * Add items to the end of an array
+   * @param item
+   */
+
+  push(item: any): void {
+    this._array.push(item);
+    if (this._array.length > this._limit) this._array.shift();
+  }
+
+  /**
+   * Return the items within the array
+   * @returns {[]}
+   */
+  get(): any[] {
+    return this._array;
+  }
+
+  /**
+   * Limits the size of the array
+   * @param size
+   */
+  limit(size: number): void {
+    this._limit = size;
+    if (this._array.length > this._limit) this._array = this._array.slice(this._array.length - this._limit);
+  }
+
+  /**
+   * Returns the length of the array
+   * @returns {number}
+   */
+  length(): number {
+    return this._array.length;
+  }
+
+  /**
+   * Bulk add an array to the array
+   * @param items
+   */
+  add(items: any[]): void {
+    this._array = this._array.concat(items);
+
+    if (this._array.length > this._limit) this._array = this._array.slice(this._array.length - this._limit);
+  }
+
+  /**
+   * Remove an item from the beginning of an array
+   * @returns {*}
+   */
+  shift(): any {
+    return this._array.shift();
+  }
+}