# All files / util obj.ts

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     /**
     * Copyright 2017 Google Inc.
     *
     * 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.
     */

    import { assert } from './assert';

    export interface Dict<V> {
      [stringKey: string]: V;
      [numberKey: number]: V;
    }

    export function contains<V>(obj: Dict<V>, key: string | number): boolean {
      return Object.prototype.hasOwnProperty.call(obj, key);
    }

    export function get<V>(obj: Dict<V>, key: string | number): V | null {
      return Object.prototype.hasOwnProperty.call(obj, key) ? obj[key] : null;
    }

    export function size<V>(obj: Dict<V>): number {
      let count = 0;
      for (const key in obj) {
        if (Object.prototype.hasOwnProperty.call(obj, key)) {
          count++;
        }
      }
      return count;
    }

    /** Returns the given value if it's defined or the defaultValue otherwise. */
    export function defaulted<V>(value: V | undefined, defaultValue: V): V {
      return value !== undefined ? value : defaultValue;
    }

    export function forEachNumber<V>(
      obj: Dict<V>,
      fn: (key: number, val: V) => void
    ): void {
      for (const key in obj) {
        Eif (Object.prototype.hasOwnProperty.call(obj, key)) {
          const num = Number(key);
          Eif (!isNaN(num)) {
            fn(num, obj[key]);
          }
        }
      }
    }

    export function forEach<V>(
      obj: Dict<V>,
      fn: (key: string, val: V) => void
    ): void {
      for (const key in obj) {
        Eif (Object.prototype.hasOwnProperty.call(obj, key)) {
          fn(key, obj[key]);
        }
      }
    }

    export function lookupOrInsert<V>(
      obj: Dict<V>,
      key: string | number,
      valFn: () => V
    ): V {
      if (!contains(obj, key)) {
        obj[key] = valFn();
      }
      return obj[key];
    }

    export function isEmpty<V>(obj: Dict<V>) {
      assert(
        obj != null && typeof obj === 'object',
        'isEmpty() expects object parameter.'
      );
      for (const key in obj) {
        Eif (Object.prototype.hasOwnProperty.call(obj, key)) {
          return false;
        }
      }
      return true;
    }

    export function shallowCopy<V>(obj: Dict<V>): Dict<V> {
      assert(
        obj && typeof obj === 'object',
        'shallowCopy() expects object parameter.'
      );
      const result: Dict<V> = {};
      for (const key in obj) {
        Eif (Object.prototype.hasOwnProperty.call(obj, key)) {
          result[key] = obj[key];
        }
      }
      return result;
    }