CODEWITHSUNDEEP
javascriptloopstypescriptsumconcatenation
Niek Jonkman
Niek Jonkman

Reputation: 1056

Typescript array sum instead concatenation

I have a problem with calculating a sum in typescript where I have 2 numbers that concatenate instead of summing it all up. I have looked up this issue and have seen several topics covering this problem where the solution usually was like this:

"use ParseInt() or ParseFloat() to convert your strings to integers"

The problem is that I don't have strings and even though that I use numbers they still concatenate.

My code is as follows:

     updateSummaryAmount(index: number){
        let summary = 0;

        this.listOfPeriods[index].declarations.forEach(element => {
            summary = summary + element.amount;
        });

        this.listOfPeriods[index].summary = summary;
    }

If I sum

0,55

And

0,45

I get

00,550,45

When I try to use parseInt() or parseFloat(0 I get the following typescript error:

[ts} Argument of type 'number'  is not assignable to parameter of type 'string'.

I have tried to sum with Math.floor(), just to test, and this works but obviously gives me floored down numbers that I don't want.

How do I sum up 2 values in my case?

Upvotes: 0

Views: 3973

Answers (1)

Avin Shum
Avin Shum

Reputation: 476

try below to force change element.amount to number

this.listOfPeriods[index].declarations.forEach(element => {
  summary = summary + (+element.amount);
});

Upvotes: 6

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