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array-prototype.js

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function filter(arr, callback) {

const newArray = [];

for (let i = 0; i < arr.length; i++) {

if (callback(arr[i], i, arr)) {

newArray.push(arr[i])

}

return newArray;

}

function filterObject(object, callback) {

let newOject = {};

for (const key in object) {

if (callback(object[key], key, object)) {

newOject = { ...newOject, ...{ [key]: object[key] } };

}

return newOject;

}

// const objFilter = { a: 2, b: 3, c: 4, f: 10 }

// console.log(filterObject(objFilter, (value => value > 3)));

// const arr = [1, 2, 2, 3, 4, 5, 6]

// console.log(filter(arr, (x => x > 3)))

// filter(arr, ((x, i, a) => {

// console.log(i);

// }))

function map(array, callback) {

const newArray = [];

for (let i = 0; i < array.length; i++) {

newArray.push(callback(array[i], i, array))

}

return newArray;

}

function objectMap(object, callback) {

let newOject = {}

for (const key in object) {

newOject = { ...newOject, ...{ [key]: callback(object[key], key) } }

}

return newOject;

}

// const array = [1, 2, 3, 4]

// const array = [{ x: 2, y: 3 }, { x: 2, y: 3 }]

// console.log(map(array, (x => x.x)));

// const obj = { a: 2, b: 3, x: 4 }

// console.log(Object.keys(obj));

// console.log(

// objectMap(obj, ((val, key) => {

// return val * 2;

// }

// ))

// );

function reduce(array, callback, initialValue) {

let accumulator = initialValue ?? 0;

for (let i = 0; i < array.length; i++) {

accumulator = callback(accumulator, array[i], i, array)

}

return accumulator;

}

function objectReduce(object, callback, initialValue) {

let accumulator = initialValue ?? 0;

for (const key in object) {

accumulator = callback(accumulator, object[key], key, object);

}

return accumulator;

}

// const array = [1, 2, 3, 4]

const object = { a: 2, b: 3, x: 4 }

// console.log(reduce(array, ((acc, item) => {

// acc.push()

// }), [] ));

// console.log(

// objectReduce(object, ((acc, value, key) => {

// acc += value;

// return acc;

// }), 0)

// );

// function flat(array, depth = 1) {

// return array.reduce((acc, item) => {

// if (Array.isArray(item)) {

// if (depth >= 1) {

// acc.push(...flat(item, depth - 1))

// return acc;

// }

// acc.push(item)

// return acc;

// }, [])

// }

function flat(array, depth = 1) {

return array.reduce((acc, item) => {

if (Array.isArray(item) && depth >= 1) {

acc.push(...flat(item, depth - 1))

return acc;

}

acc.push(item);

return acc;

}, [])

}

const arr = [[1, 2], 3, [8, 4, [5, 6]]];

console.log(flat(arr));