@ngha/nested-value/README.md

nestedValue the value at `path` of `object`

# nested-value

This library get object value by path

## Usage

Import `NestedValueModule` to your module

```ts
import { NgModule } from '@angular/core';
import { BrowserModule  } from '@angular/platform-browser';
import { AppComponent } from './app';
 
import { NestedValueModule } from '@ngha/nested-value';
@NgModule({
  imports: [NestedValueModule],
})
export class AppModule {}
```


### nested-value

Returns value of an object value 

**Usage:** `object | nestedValue: 'path' :  'defaultValue'`

```angular2html
  <p>{{{ 'a': 'aa' } | nestedValue:'a'}}</p>
  <!-- Output: "aa" -->
  <p>{{{ c: [{ d: '123', e: 'abc' }, { d: '456', e: 'def' }] } | nestedValue:'c[0].d'}}</p>
  <!-- Output: "123" -->
  <p>{{{ c: [{ d: '123', e: 'abc' }, { d: '456', e: 'def' }] } | nestedValue:['c', [1], 'e']}}</p>
  <!-- Output: "def" -->
  <p>{{{ c: [{ d: '123', e: 'abc' }, { d: '456', e: 'def' }] } | nestedValue:['c', [3], 'f']: 'default'}}</p>
  <!-- Output: "default" -->
  <p>{{{ c: [{ d: '123', e: 'abc' }, { d: '456', e: 'def' }] } | nestedValue:['c', [3], 'f']}}</p>
  <!-- Output: undefine -->
```

```typescript
 import {NestedValueService} from '@ngha/nested-value'
 
 @Component({
   providers: [TransformObjectService],
 })
 export class AppComponent
 {
   constructor(private service: TransformObjectService)
   {
     const obj = {
      aa: [{ b: { c: 0 }, 1: 0 }],
      dd: { ee: { ff: 2 } },
      gg: { h: 2 },
      'gg.h': 1,
      'kk.ll': { 'mm.n': [3, 4, { 'oo.p': 5 }, { 'oo': { p: 6 } }] },
      tt: null
     };

      const result1 = this.service.nestedValue(obj , 'aa[0].b.c' ) === obj['aa'][0]['b']['c'] 
      // Output: result1 = true
      const result2 = this.service.nestedValue(obj , 'aa[0][1]') === obj['aa'][0][1]
      // Output: result2 = true
      const result3 = this.service.nestedValue(obj , ['kk.ll', 'mm.n', 2, 'oo.p']) === obj['kk.ll']['mm.n'][2]['oo.p']
      // Output: result3 = true
      const result4 = this.service.nestedValue(obj , ['kk.ll', 'mm.n', 3, 'oo', 'p']) === 6
      // Output: result4 = true
      const result5 = this.service.nestedValue(undefine , ['kk'] , 1) === 1
      // Output: result5 = true
      const result6 = this.service.nestedValue(undefine , 'kk') === undefine
      // Output: result6 = true

   }
 
 }

```