1  import map from 'iter-tools-es/methods/map';
 2  
 3  export const { hasOwn, getOwnPropertySymbols, getPrototypeOf, fromEntries } = Object;
 4  
 5  export const isObject = (obj) => obj !== null && typeof obj === 'object';
 6  export const { isArray } = Array;
 7  export const isFunction = (obj) => typeof obj === 'function';
 8  export const isSymbol = (obj) => typeof obj === 'symbol';
 9  export const isString = (obj) => typeof obj === 'string';
10  export const isRegex = (obj) => obj instanceof RegExp;
11  export const isPattern = (obj) => isString(obj) || isRegex(obj);
12  export const isType = (obj) => isSymbol(obj) || isString(obj);
13  
14  export const objectKeys = (obj) => {
15    return {
16      *[Symbol.iterator]() {
17        for (let key in obj) if (hasOwn(obj, key)) yield key;
18        yield* getOwnPropertySymbols(obj);
19      },
20    };
21  };
22  
23  export const objectValues = (obj) => {
24    return {
25      *[Symbol.iterator]() {
26        for (let key in obj) if (hasOwn(obj, key)) yield obj[key];
27        yield* map((sym) => obj[sym], getOwnPropertySymbols(obj));
28      },
29    };
30  };
31  
32  export const objectEntries = (obj) => {
33    return {
34      *[Symbol.iterator]() {
35        for (let key in obj) if (hasOwn(obj, key)) yield [key, obj[key]];
36        yield* map((sym) => [sym, obj[sym]], getOwnPropertySymbols(obj));
37      },
38    };
39  };
40  
41  export const mapObject = (fn, obj) => {
42    let result = {};
43    for (let key in obj) if (hasOwn(obj, key)) result[key] = fn(obj[key]);
44    for (const sym of getOwnPropertySymbols(obj)) result[sym] = fn(obj[sym]);
45    return result;
46  };
47  
48  export const arrayLast = (arr) => arr[arr.length - 1];