TTP Javascript Recreating Prototype Assignment

2x.js

var array1 = ["Apple", "Orange", "Pear", "Lemon"]



let myEach = (array, callback) => {
    for(let i = 0; i < array.length; i++){
        callback(array[i])
    }
}

// myEach(array1,function(element){
//   console.log(element)
// });

let myMap = (array, callback) => {
    let newArray = []
    for(let i = 0; i < array.length; i++){
        newArray[i] = callback(array[i]);
    }
    return newArray
}

// const testMap = myMap(array1, element => element + "2x")
//
// console.log(testMap)

let myFilter = (array, callback) => {
    let newArray = []
    for(let i = 0; i < array.length; i++){
        if(callback(array[i])){
            newArray.push(array[i])
        }
    }
    return newArray
}

// const filter = myFilter(array1, element => element.length < 5)
// console.log(filter)

let mySome = (array, callback) => {
    for(let i = 0; i < array.length; i++){
        if(callback(array[i]))
            return true
    }
    return false
}

// const some = mySome(array1, element => element.length < 5)
// console.log(some)

let myEvery = (array, callback) => {
    let flag = false

    if(array.length === 0)
        return true
    for(let i = 0; i < array.length; i++){
        if(callback(array[i]))
            flag = true
        else {
            flag = false
        }
    }
    return flag
}

// const every = myEvery(array1, element => element.length < 5)
// console.log(every)

let myReduce = (array, callback) => {
    let result;


    for(let i = 0; i < array.length; i++){
        result = callback(result,array[i])
    }
    return result
}

// Not sure why there's an undefined here?
// const reducer = (accumulator, currentValue) => accumulator + currentValue
// const reduceResult = myEvery(array1, reducer)
// console.log(reduceResult)

let myIncludes = (array, callback) => {
    for(let i = 0; i < array.length; i++){
        if(array[i] === callback)
            return true
    }
    return false;
}

// const includes = myIncludes(array1, "Lemon")
// console.log(includes)

let myIndexOf = (array, element) => {
    for(let i = 0; i < array.length; i++){
        if(array[i] === element)
            return i
    }
    return -1
}

// let indexof = myIndexOf(array1, "Lemon")
// console.log(indexof)
// indexof = myIndexOf(array1, "emon")
// console.log(indexof)

let myPush = (array, elementToAdd) => {
    array[array.length] = elementToAdd
}

// myPush(array1, "test")
// console.log(array1)

let myLastIndexOf = (array, element) => {
    let lastIndex = -1
    for(let i = 0; i < array.length; i++){
        if(array[i] === element)
            lastIndex = i
    }
    return lastIndex
}

console.log(myLastIndexOf(array1, "Apple"))

let user = {
  name: "John",
  age: 30,
  isAdmin: true
};

let grabValues = (kv) => {
    let result = []
    for(val in kv){
        result.push(val)
    }
    return result
}

grabValues(user)
let grabKeys = (kv) => {
    let result = []
    for(val in kv){
        result.push(kv[val])
    }
    return result
}