bootstrap-vue/src/utils/loose-equal.js

Quickly integrate Bootstrap 4 components with Vue.js

import { isArray} from './array';
import { keys} from './object';

/**
 * Quick object check - this is primarily used to tell
 * Objects from primitive values when we know the value
 * is a JSON-compliant type.
 */
function isObject(obj) {
  return obj !== null && typeof obj === 'object';
}

/**
 * Check if two values are loosely equal - that is,
 * if they are plain objects, do they have the same shape?
 * Returns boolean true or false
 */
function looseEqual(a, b) {
  if (a === b) return true;
  const isObjectA = isObject(a);
  const isObjectB = isObject(b);
  if (isObjectA && isObjectB) {
    try {
      const isArrayA = isArray(a);
      const isArrayB = isArray(b);
      if (isArrayA && isArrayB) {
        return a.length === b.length && a.every((e, i) => {
          return looseEqual(e, b[i]);
        });
      } else if (!isArrayA && !isArrayB) {
        const keysA = keys(a);
        const keysB = keys(b);
        return keysA.length === keysB.length && keysA.every(key => {
          return looseEqual(a[key], b[key]);
        });
      } else {
        return false;
      }
    } catch (e) {
      return false;
    }
  } else if (!isObjectA && !isObjectB) {
    return String(a) === String(b);
  } else {
    return false;
  }
}

export default looseEqual;