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index.js
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index.js
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function* entries(obj) {
for (let key in obj) {
if (obj.hasOwnProperty(key)) yield [key, obj[key]];
}
}
function every(obj, fn) {
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
if (!fn(obj[key], key, obj)) return false;
}
return true;
}
function filter(obj, fn) {
const result = {};
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
if (fn(obj[key], key, obj)) result[key] = obj[key];
}
return result;
}
function find(obj, fn) {
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
if (fn(obj[key], key, obj)) return obj[key];
}
}
function findKey(obj, fn) {
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
if (fn(obj[key], key, obj)) return key;
}
}
function flat(obj, depth = 1) {
const result = {};
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
if (depth <= 0 || typeof obj[key] !== 'object' || obj[key] === null) {
result[key] = obj[key];
} else {
Object.assign(result, flat(obj[key], depth - 1));
}
}
return result;
}
function flatMap(obj, fn) {
const result = {};
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
const value = fn(obj[key], key, obj);
if (typeof value !== 'object' || value === null) {
result[key] = value;
} else {
Object.assign(result, value);
}
}
return result;
}
function forEach(obj, fn) {
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
fn(obj[key], key, obj);
}
}
function includes(obj, value) {
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
if (obj[key] === value) return true;
}
return false;
}
function keyOf(obj, value) {
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
if (obj[key] === value) return key;
}
}
function* keys(obj) {
for (let key in obj) {
if (obj.hasOwnProperty(key)) yield key;
}
}
function map(obj, fn) {
const result = {};
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
result[key] = fn(obj[key], key, obj);
}
return result;
}
function mapKeys(obj, fn) {
const result = {};
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
result[fn(obj[key], key, obj)] = obj[key];
}
return result;
}
function reduce(obj, fn, ...args) {
const noInitialValue = {};
let accumulator = args.length > 0 ? args[0] : noInitialValue;
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
accumulator = accumulator === noInitialValue ? obj[key] : fn(accumulator, obj[key], key, obj);
}
if (accumulator === noInitialValue) throw TypeError('Reduce of empty object with no initial value');
return accumulator;
}
function some(obj, fn) {
for (let key in obj) {
if (!obj.hasOwnProperty(key)) continue;
if (fn(obj[key], key, obj)) return true;
}
return false;
}
function* values(obj) {
for (let key in obj) {
if (obj.hasOwnProperty(key)) yield obj[key];
}
}
module.exports = {entries, every, filter, find, findKey, flat, flatMap, forEach, includes, keyOf, keys, map, mapKeys, reduce, some, values};