@angular/core
Version:
Angular - the core framework
48 lines • 4.19 kB
JavaScript
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Indicates that the result of a {@link Pipe} transformation has changed even though the
* reference has not changed.
*
* 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
* }
* ```
*
* @publicApi
*/
export class WrappedValue {
constructor(value) {
this.wrapped = value;
}
/** Creates a wrapped value. */
static wrap(value) {
return new WrappedValue(value);
}
/**
* Returns the underlying value of a wrapped value.
* Returns the given `value` when it is not wrapped.
**/
static unwrap(value) {
return WrappedValue.isWrapped(value) ? value.wrapped : value;
}
/** Returns true if `value` is a wrapped value. */
static isWrapped(value) {
return value instanceof WrappedValue;
}
}
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