How do i add cumulative values from an array

Asked Jan 24 '20 at 20:46

Active Jan 24 '20 at 21:20

Viewed 35 times

let Tota_principal = h.map(value=> value['Principal'])

var new_array = [];
Tota_principal.reduce(function(a,b,i) { 
    return new_array[i] = a+b; 
},0)

console.log(new_array)

The new_array gives a concatenated value rather than a cumulative sum of the table. also where do i add toFixed()

edited Jan 24 '20 at 21:20

Rounin

27,134
9
83
108

asked Jan 24 '20 at 20:46

Engr Ebuka Orioha

2

please add some data as well. – Nina Scholz Jan 24 '20 at 20:48
Use `parseFloat(b)` instead of just `b`. – Barmar Jan 24 '20 at 20:49
use `toFixed()` when you're displaying the results, not when you're calculating. – Barmar Jan 24 '20 at 20:50
You're getting concatenation because the array contains strings rather than numbers. It would be better if you put numbers in the array in the first place. – Barmar Jan 24 '20 at 20:51
@Barmar. The value is not coming from a source. i am only fetching the values.So how do i convert from string to an int – Engr Ebuka Orioha Jan 24 '20 at 20:54
@Barmar. thanks i have been able to convert to int. but where do i use toFixed() in my return array – Engr Ebuka Orioha Jan 24 '20 at 21:04
please add the missing parts to the question, if the problem is different from the duplicate target. – Nina Scholz Jan 24 '20 at 21:06
@EngrEbukaOrioha You don't. You use it when displaying the results. `console.log(toFixed(new_array[i], 2))` – Barmar Jan 24 '20 at 21:09
@Barmar. thats the error 'toFixed is not defined' – Engr Ebuka Orioha Jan 24 '20 at 21:15
Sorry, meant `console.log(new_array[i].toFixed(2))` – Barmar Jan 24 '20 at 23:26
@Barmar. Thanks. this explains what i needed 'toFixed() when you're displaying the results, not when you're calculating' – Engr Ebuka Orioha Jan 25 '20 at 07:07

How do i add cumulative values from an array

0 Answers0