# @angular-ru/cdk/object

* `sortByAsc`

```typescript
const objectList: A[] = [{a: 1}, {a: 3}, {a: 2}, {a: -1}, {a: 0}];

expect(objectList.slice().sort((a, b) => sortByAsc('a', a, b))).toEqual([{a: -1}, {a: 0}, {a: 1}, {a: 2}, {a: 3}]);
```

* `sortByDesc`

```typescript
const objectList: A[] = [{a: 1}, {a: 3}, {a: 2}, {a: -1}, {a: 0}];

expect(objectList.slice().sort((a, b) => sortByDesc('a', a, b))).toEqual([{a: 3}, {a: 2}, {a: 1}, {a: 0}, {a: -1}]);
```

* `isObject` - check inheritance of object

```typescript
import {isObject} from '@angular-ru/cdk/object';

class A {}

expect(isObject(NaN)).toBe(false);
expect(isObject(null)).toBe(false);
expect(isObject(undefined)).toBe(false);
expect(isObject(1)).toBe(false);
expect(isObject(Infinity)).toBe(false);
expect(isObject('')).toBe(false);
// non primitive
expect(isObject([])).toBe(true);
expect(isObject({})).toBe(true);
expect(isObject(new A())).toBe(true);
expect(isObject(new Date())).toBe(true);
expect(isObject(new Map())).toBe(true);
expect(isObject(() => {})).toBe(true);
expect(isObject(new Number(6))).toBe(true);
expect(isObject(Math)).toBe(true);
expect(isObject(Object.create(null))).toBe(true);
expect(isObject(document.createElement('div'))).toBe(true);
expect(isObject(new (function Foo() {})())).toBe(true);
expect(isObject(window)).toBe(true);
```

* `isPlainObject` - check only literal object (non instance object)

```typescript
import {isPlainObject} from '@angular-ru/cdk/object';

class A {}

expect(isPlainObject(NaN)).toBe(false);
expect(isPlainObject(null)).toBe(false);
expect(isPlainObject(undefined)).toBe(false);
expect(isPlainObject(1)).toBe(false);
expect(isPlainObject(Infinity)).toBe(false);
expect(isPlainObject('')).toBe(false);
// plain object
expect(isPlainObject({})).toBe(true);
expect(isPlainObject(Object.create(null))).toBe(true);
// complex object (not plain literal)
expect(isPlainObject([])).toBe(false);
expect(isPlainObject(new A())).toBe(false);
expect(isPlainObject(new Date())).toBe(false);
expect(isPlainObject(new Map())).toBe(false);
expect(isPlainObject(() => {})).toBe(false);
expect(isPlainObject(new Number(6))).toBe(false);
expect(isPlainObject(Math)).toBe(false);
expect(isPlainObject(document.createElement('div'))).toBe(false);
expect(isPlainObject(new (function Foo() {})())).toBe(false);
```

* `isSimpleObject` - check only instance object or literal (non complex structure - Array, DOM, Set, Map, Date, other structure)

```typescript
import {isSimpleObject} from '@angular-ru/cdk/object';

class A {}

expect(isSimpleObject(NaN)).toBe(false);
expect(isSimpleObject(null)).toBe(false);
expect(isSimpleObject(undefined)).toBe(false);
expect(isSimpleObject(1)).toBe(false);
expect(isSimpleObject(Infinity)).toBe(false);
expect(isSimpleObject('')).toBe(false);
// instance object, literal object
expect(isSimpleObject(new A())).toBe(true);
expect(isSimpleObject(Object.create(null))).toBe(true);
expect(isSimpleObject({})).toBe(true);
expect(isSimpleObject(new (function Foo() {})())).toBe(true);
// complex object (Array, DOM, Set, Map, other structure)
expect(isSimpleObject([])).toBe(false);
expect(isSimpleObject(new Date())).toBe(false);
expect(isSimpleObject(new Map())).toBe(false);
expect(isSimpleObject(() => {})).toBe(false);
expect(isSimpleObject(new Number(6))).toBe(false);
expect(isSimpleObject(Math)).toBe(false);
expect(isSimpleObject(document.createElement('div'))).toBe(false);
```

* `isGetter`

```typescript
import {isGetter} from '@angular-ru/cdk/object';

class A {
  public get a(): number {
    return 1;
  }

  public b: string = '2';
}

expect(isGetter(new A(), 'a')).toEqual(true);
expect(isGetter(new A(), 'b')).toEqual(false);

expect(
  isGetter(
    {
      get a() {
        return 2;
      },
    },
    'a',
  ),
).toEqual(true);

expect(
  isGetter(
    {
      _a: null,
      set a(value: any) {
        this._a = value;
      },
    },
    'a',
  ),
).toEqual(false);

expect(isGetter({a: 2}, 'a')).toEqual(false);
```

* `isIterable`

```typescript
expect(isIterable([1, 2])).toBe(true);
expect(isIterable('Some String')).toBe(true);
expect(isIterable(new Set([1, 2]))).toBe(true);
expect(
  isIterable(
    new Map([
      ['a', 1],
      ['b', 2],
    ]),
  ),
).toBe(true);
expect(
  isIterable(
    new Map([
      ['a', 1],
      ['b', 2],
    ]).entries(),
  ),
).toBe(true);

expect(isIterable({a: 1, b: 2})).toBe(false);
expect(isIterable(null)).toBe(false);
expect(isIterable(undefined)).toBe(false);
expect(isIterable(0)).toBe(false);
expect(isIterable(true)).toBe(false);
expect(isIterable(() => {})).toBe(false);
```

* `deepClone`

```typescript
import {deepClone} from '@angular-ru/cdk/object';
import {Origin} from './origin';

const origin: Origin = {a: 1, b: {c: 2}};
const copy: Origin = deepClone(origin);
expect(Object.is(origin, copy)).toEqual(false);

copy.b.c = 4;
expect(origin.b.c).toEqual(2);

origin.b.c = 3;
expect(origin.b.c).toEqual(3);
expect(copy.b.c).toEqual(4);
```

* `deepFreeze`

```typescript
import {deepFreeze} from '@angular-ru/cdk/object';
import {Origin} from './origin';

const origin: Origin = deepFreeze({a: 1, b: {c: 2}});
let message: string | null = null;

try {
  origin.b.c = 5;
} catch (e) {
  message = e.message;
}

expect(message).toEqual(`Cannot assign to read only property 'c' of object '[object Object]'`);
```

* `replaceWithNull`

```typescript
import {PlainObject} from '@angular-ru/cdk/typings';
import {replaceWithNull} from '@angular-ru/cdk/object';

const wrongElem: PlainObject = {
  a: '',
  b: [
    {c: NaN, d: 1},
    {c: '   ', d: undefined},
    {c: 0, d: 0},
  ],
  e: Infinity,
};

expect(replaceWithNull(wrongElem)).toEqual({
  a: null,
  b: [
    {c: null, d: 1},
    {c: null, d: null},
    {c: 0, d: 0},
  ],
  e: null,
});
```

* `clean`

```typescript
import {PlainObject} from '@angular-ru/cdk/typings';
import {clean} from '@angular-ru/cdk/object';

const A: PlainObject = clean({
  a: 1,
  b: undefined,
  c: '',
  d: null,
  e: NaN,
  f: [
    {
      a: 2,
      b: undefined,
      c: '',
      d: Infinity,
    },
    {
      a: 3,
      b: undefined,
      c: '',
      d: Infinity,
    },
  ],
  g: {
    a: 4,
    b: undefined,
    c: '',
    d: Infinity,
  },
  h: Infinity,
});

const B: PlainObject = {a: 1, f: [{a: 2}, {a: 3}], g: {a: 4}};

expect(A).toEqual(B);
```

* `getValueByPath`

```typescript
import {PlainObject} from '@angular-ru/cdk/typings';
import {getValueByPath} from '@angular-ru/cdk/object';

const obj: PlainObject = {a: 1, f: [{a: 2}, {a: 3}], g: {a: 4}};

expect(getValueByPath(obj, 'g.a')).toEqual(4);
expect(getValueByPath(obj, 'f.0')).toEqual({a: 2});
expect(getValueByPath(obj, 'f.0.a')).toEqual(2);
expect(getValueByPath(obj, 'abc')).toEqual(undefined);
expect(getValueByPath(obj, 'f.0.a.Z', [])).toEqual([]);
```

* `checkIsShallowEmpty`

```typescript
import {checkIsShallowEmpty} from '@angular-ru/cdk/object';

expect(checkIsShallowEmpty({a: 0})).toEqual(false);
expect(checkIsShallowEmpty({a: {b: ''}})).toEqual(false);
expect(checkIsShallowEmpty({a: 'hello'})).toEqual(false);
// shallow empty object
expect(checkIsShallowEmpty({})).toEqual(true);
expect(checkIsShallowEmpty({a: null})).toEqual(true);
expect(checkIsShallowEmpty({a: '', b: undefined, c: NaN, d: '   '})).toEqual(true);
```

* `equals, objectToString, flatten, strictEquals, shallowTrimProperties`

```typescript
it('should be object A equals object B', (): void => {
  const A: PlainObject = {a: 1, b: [1, 2]};
  const B: PlainObject = {a: 1, b: [1, 2]};

  expect(equals(A, B)).toBe(true);
});

it('should be not equals A and B when shallow comparison unsorted keys', (): void => {
  const A: PlainObject = {a: 1, c: {e: 2, d: 1}, b: [1, 2]};
  const B: PlainObject = {b: [1, 2], a: 1, c: {d: 1, e: 2}};

  expect(equals(A, B)).toBe(false);
});

it('should be not equals A and B when deep comparison unsorted keys', (): void => {
  const A: PlainObject = {a: 1, c: {e: 2, d: 1}, b: [1, 2]};
  const B: PlainObject = {b: [1, 2], a: 1, c: {d: 1, e: 2}};
  const D: PlainObject = {a: 1, b: 2, c: [{e: 2, d: 1}]};
  const E: PlainObject = {a: 1, b: 2, c: [{d: 1, e: 2}]};

  expect(equals(A, B, {deep: true})).toBe(true);
  expect(equals(D, E, {deep: true})).toBe(true);
});

it('should be return true for equals primitive types', (): void => {
  expect(equals(null!, null!)).toBe(true);
  expect(equals(undefined!, undefined!)).toBe(true);
  expect(equals(NaN as NaN as any)).toBe(true);
  expect(equals(Infinity as Infinity as any)).toBe(true);
  expect(equals('' as '' as any)).toBe(true);
  expect(equals(1 as 1 as any)).toBe(true);

  expect(equals('1' as 1 as any)).toBe(false);
  expect(equals(null!, undefined!)).toBe(false);
  expect(equals(NaN as !undefined, {deep: true})).toBe(false);
});

it('should be a proper comparison with a weak and strict type', (): void => {
  expect(equals({a: '1'}, {a: 1})).toBe(false);
  expect(equals({a: '1'}, {a: 1}, {weekType: true})).toBe(true);
});

it('should be correct work objectToString', (): void => {
  expect(objectToString(1 as any)).toBe('1');
  expect(objectToString('1' as any)).toBe('"1"');
  expect(objectToString(null!)).toBe('null');
  expect(objectToString(undefined!)).toBe(undefined);

  expect(objectToString({a: 1, b: 2})).toBe('{"a":1,"b":2}');

  expect(objectToString([{b: 2, a: 1}])).toBe('[{"b":2,"a":1}]');

  expect(objectToString([{b: 2, a: 1}], {deep: true})).toBe('[{"a":1,"b":2}]');

  expect(objectToString({a: 1, b: 2, c: [{e: 2, d: 1}]})).toBe('{"a":1,"b":2,"c":[{"e":2,"d":1}]}');

  expect(objectToString({a: 1, b: 2, c: [{e: 2, d: 1}]}, {deep: true})).toBe('{"a":1,"b":2,"c":[{"d":1,"e":2}]}');
});

it('should be correct flatten object', (): void => {
  const actual: PlainObject = {
    a: {
      b: 1,
      c: {
        d: 2,
      },
      d: [{e: 3}, {f: 4}],
    },
    g: 5,
  };

  const expected: PlainObject = {'a.b': 1, 'a.c.d': 2, 'a.d.0.e': 3, 'a.d.1.f': 4, g: 5};

  expect(flatten<number>(actual)).toEqual(expected);
});

it('should be correct deep equals with week type', (): void => {
  expect(
    strictEquals(
      {
        a: 1,
        b: 2,
        c: {d: {f: {g: 'd'}}},
      },
      {
        a: 1,
        b: 2,
        c: {d: {f: {g: 'i'}}},
      },
    ),
  ).toEqual(false);

  expect(
    strictEquals(
      {
        a: null,
        b: undefined,
        c: NaN,
      },
      {
        a: null,
        b: null,
        c: null,
      },
    ),
  ).toEqual(true);

  expect(
    strictEquals(
      {
        a: null,
        b: undefined,
      },
      {
        a: null,
        b: null,
        c: null,
      },
    ),
  ).toEqual(false);
});
```

* `shallowMapObject`

```typescript
import {shallowMapObject} from '@angular-ru/cdk/object';

const oneTypeObject = {a: 1, b: 3, c: 5};
expect(shallowMapObject(oneTypeObject, (a: number): number => a * 2)).toEqual({
  a: 2,
  b: 6,
  c: 10,
});

const complexObject = {a: 1, b: 'two', c: true, d: undefined, e: null, f: {field: 'value'}, g: [1, 2, 3]};
expect(shallowMapObject(complexObject, (a): string => JSON.stringify(a))).toEqual({
  a: '1',
  b: '"two"',
  c: 'true',
  d: undefined,
  e: 'null',
  f: '{"field":"value"}',
  g: '[1,2,3]',
});
```


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