src/app/shared/pipes/objToArrayPipe/obj-to-array.pipe.ts

/********************************************************************************
 * Copyright (c) 2020 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 ********************************************************************************/
import {Pipe, PipeTransform} from "@angular/core";


/**
 * Converts an object to an array containing objects with key and value tags
 * example: Object{prop1: "propValue1", prop2: "propValue2"}
 * ->
 * [Object{key: 'prop1', value: 'propValue1'},
 * Object{key: 'prop2', value: 'propValue2'}]
 */

@Pipe({name: "objToArray"})
export class ObjToArrayPipe implements PipeTransform {

    public transform<T extends object>(value: T, keepNullOrUndefined: boolean = false): Array<{ key: number | string, value: T }> {
        return (typeof value !== "object" || value == null ? [] : Object.keys(value))
            .map((key) => ({key, value: value[key]}))
            .filter((obj) => keepNullOrUndefined || obj?.value != null);
    }

}