Javascript Practice 80: JS Hero - To be continued ...

 

Question: 

Write a function digitsum that calculates the digit sum of an integer. The digit sum of an integer is the sum of all its digits.

Example: digitsum(192) should return 12.

Answer: 

function digitsum (n) {

let digits = n.toString().split('').map(x => x * 1); 

let sum = digits.reduce((acc,cv) => acc + cv); 

return sum;

};

> declare a function 'digitsum'

> it has one parameter 'n' 

> we create our first variable 'digits' 

> we initialize it with the output we get by converting the input 'n' 

>>> from a number to a string, 

>>> then splitting the string in an array format 

>>> and then converting the array of strings to a number by using the map method

> we then create our final variable sum and initialize it with a value we get by using the reduce method on the variable 'digits' 

> finally we return 'sum'