Javascript Practice 74: JS Hero - String: split()

 

Question: 

Write a function add that takes a string with a summation task and returns its result as a number. A finite number of natural numbers should be added. The summation task is a string of the form '1+19+...+281'.

Example: add('7+12+100') should return 119.

Answer: 

function add (str) {

const red = (acc, cv) => acc + cv; 

let abcd = str; 

let cdef = abcd.split('+').map(Number); 

return cdef.reduce(red); 

} 

> we declare a function 'add'

> it has 1 parameter 'str' 

> we first declare a variable to use in the reduce method and call it 'red' 

> it basically stores the accumulated value of the array elements which are numbers 

> we then declare a variable 'abcd' which will be the string

> we then convert that string into an array object and use the map method to convert it to a number

> we store that output in a variable 'cdef' 

> we then reduce the 'cdef' variable to a single number by using the reduce method  

> we use the function 'red' along with reduce method

> we return that statement to get our answer