src.app.shared.equals.ts Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of ui Show documentation
The newest version!
/**
 * Copyright 2017-2023 Enedis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

export abstract class Equals {
  abstract equals(obj: T): boolean;
}

// Unlike classes, interfaces exist only at compile-time. It is not possible to do a common instanceof check
export function instanceOfEquals(obj: any): obj is Equals {
  return 'equals' in obj;
}

export function areEquals(val1: any, val2: any): boolean {
  // NaN === NaN --> false
  // isNaN(undefined) --> true
  if (isNaN(val1) && isNaN(val2) && typeof val1 === 'number' && typeof val2 === 'number') return true;

  if (val1 === val2) return true;

  if (typeof val1 === 'object') {
    if (val1 == null) return false;
    if (val2 == null) return false;

    if ((val1 instanceof Array) && (val2 instanceof Array)) {
      if (val1.length != val2.length) return false;
      for (const idx in val1) {
        if (!areEquals(val1[idx], val2[idx])) return false;
      }

      return true;
    }

    if (instanceOfEquals(val1) && instanceOfEquals(val2)) {
      return val1.equals(val2);
    }

    return val1 == val2;
  }

  return false;
}

export function isNotEmpty(value: string): boolean {
  return value && value !== '';
}