Array Map, Filter, Reduce methods (Array mfr in short)

Use map when you want to change each value in the array based on some logic

var mappedArray = [2,4].map(number => number * 2)

console.log(mappedArray)


Use filter when you want filter out some values from an array based on some logic

var filteredArray = [1,2,3,4].filter(number => (number % 2 === 0))

console.log(filteredArray)


Use reduce when you want to reduce an array into a single resulting value

var reducedArray = [1,2,3,4].reduce((total,number) => total + number, 0)

console.log(reducedArray)

Cute reference: https://medium.com/@joshpitzalis/the-trouble-with-loops-f639e3cc52d9