@angular/core
Version:
Angular - the core framework
43 lines • 4.48 kB
JavaScript
/**
* @license
* Copyright Google LLC 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
*/
/**
* Transforms a value (typically a string) to a boolean.
* Intended to be used as a transform function of an input.
*
* @usageNotes
* ```typescript
* @Input({ transform: booleanAttribute }) status!: boolean;
* ```
* @param value Value to be transformed.
*
* @publicApi
*/
export function booleanAttribute(value) {
return typeof value === 'boolean' ? value : value != null && value !== 'false';
}
/**
* Transforms a value (typically a string) to a number.
* Intended to be used as a transform function of an input.
* @param value Value to be transformed.
* @param fallbackValue Value to use if the provided value can't be parsed as a number.
*
* @usageNotes
* ```typescript
* @Input({ transform: numberAttribute }) id!: number;
* ```
*
* @publicApi
*/
export function numberAttribute(value, fallbackValue = NaN) {
// parseFloat(value) handles most of the cases we're interested in (it treats null, empty string,
// and other non-number values as NaN, where Number just uses 0) but it considers the string
// '123hello' to be a valid number. Therefore we also check if Number(value) is NaN.
const isNumberValue = !isNaN(parseFloat(value)) && !isNaN(Number(value));
return isNumberValue ? Number(value) : fallbackValue;
}
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