Published
Edited
Jul 11, 2018
2 stars
{
const hof = myOwnCallback => {
console.log('myOwnCallback is - ', myOwnCallback)
myOwnCallback(5)
}
const f = x => 2 * x
return hof('ala')
}
{
const hof = myOwnCallback => {
console.log('myOwnCallback is - ', myOwnCallback)
myOwnCallback(5)
}
const f = x => 2 * x
return hof(f(10))
}
{
const hof = myOwnCallback => {
console.log('myOwnCallback is - ', myOwnCallback)
return myOwnCallback(5)
}
const f = x => 2 * x
return hof(f)
}
{
const hof = myOwnCallback => myOwnCallback(5)
const f = x => 2 * x
return hof(f)
}
{
const numbers = [10, 5, 87, 19, 99, 15]
numbers.forEach((el, i, arr) => {
console.log(el)
})
}
{
const numbers = [10, 5, 87, 19, 99, 15]
numbers.forEach(el => console.log(el))
}
{
const numbers = [10, 5, 87, 19, 99, 15]
numbers.forEach(number => console.log(number))
}
{
const numbers = [10, 5, 87, 19, 99, 15]
const resultOfForEach = numbers.forEach(number => console.log(number))
return resultOfForEach
}
{
const numbers = [10, 5, 87, 19, 99, 15]
let sum = 0
for(let i = 0; i < numbers.length; i++){
sum += numbers[i]
}
return sum
}
{
const numbers = [10, 5, 87, 19, 99, 15]
let sum = 0
numbers.forEach(number => sum += number)
return sum
}
{
const numbers = [10, 5, 87, 19, 99, 15]
return numbers.map((el, i, arr) => 'Element ' + i + ' o wartości ' + el)
}
{
const numbers = [10, 5, 87, 19, 99, 15]
const newArray = numbers.map(number => number * 2)
return newArray
}
{
const numbers = [10, 5, 87, 19, 99, 15]
const newArray = numbers.map(number => number * 2)
return numbers
}
{
const numbers = [10, 5, 87, 19, 99, 15]
return numbers.filter((el, i, arr) => el > 10)
}
{
const numbers = [10, 5, 87, 19, 99, 15]
return numbers.filter((el, i, arr) => el > 10 && el < 80)
}
{
const numbers = [10, 5, 87, 19, 99, 15]
return numbers.filter((el, i, arr) => true)
}
{
const numbers = [10, 5, 87, 19, 99, 15]
return numbers.filter((el, i, arr) => false)
}
{
const numbers = [10, 5, 87, 19, 99, 15]
return numbers.filter((el, i, arr) => 1)
}
{
const numbers = [10, 5, 87, 19, 99, 15]
return numbers.filter((el, i, arr) => 0)
}
{
const numbers = [10, 5, 87, 19, 99, 15]
return numbers.find((el, i, arr) => el > 10 && el < 80)
}
{
const numbers = [10, 5, 87, 19, 99, 15]
return numbers.find((el, i, arr) => el > 10 && el < 15) // there no elements greater than 10 and less than 15
}
{
const numbers = [1,2,3]
const sum = numbers.reduce(
(reduced, number, i, arr) => reduced + number, // we MUST return new reduced value for next call
0
)
return sum
}
{
const numbers = [123, 353464, 86, 3]
return numbers.reduce((r, el) => r + el)
}
{
const names = ['Ala', 'Ela', 'Ilona']
return names.reduce((reduced, name, i, arr) => reduced + name + (i === arr.length - 1 ? '.' : ' '), '')
}
{
const numbers = [1.5, 2, 5.5, 1, 6, 10]
return numbers
.map(number => number * 2)
.filter(number => number % 2 === 0)
.reduce((r, el) => r + el)
}
{
const numbers = [1.5, 2, 5.5, 1, 6, 10]
const add = (a, b) => a + b
const even = x => x % 2 === 0
return numbers
.map(number => number * 2)
.filter(even)
.reduce(add)
}
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