WrappedValue

Indicates that the result of a Pipe transformation has changed even though the reference has not changed.

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class WrappedValue {
  static wrap(value: any): WrappedValue
  static unwrap(value: any): any
  static isWrapped(value: any): value is WrappedValue
  constructor(value: any)
  wrapped: any
}

Description

Wrapped values are unwrapped automatically during the change detection, and the unwrapped value is stored.

Example:

if (this._latestValue === this._latestReturnedValue) {
   return this._latestReturnedValue;
 } else {
   this._latestReturnedValue = this._latestValue;
   return WrappedValue.wrap(this._latestValue); // this will force update
 }

Static methods

wrap()
Creates a wrapped value.
static wrap(value: any): WrappedValue Parameters value any Returns WrappedValue

unwrap()
Returns the underlying value of a wrapped value. Returns the given value when it is not wrapped.
static unwrap(value: any): any Parameters value any Returns any

isWrapped()
Returns true if value is a wrapped value.
static isWrapped(value: any): value is WrappedValue Parameters value any Returns value is WrappedValue

Constructor

constructor(value: any) Parameters value any

Properties

Property	Description
wrapped: any