Sum of Array with filter and reduce

Question

i'm trying to get the total of all my products in my list.

this.totalValue = this.items.filter((item) => item.qtyvalue)
                            .map((item) => item.qtyvalue)
                            .reduce((sum, current) => sum + current)

This is almost working as it gives me 650.00110.0030175.0050.00

But i want the numbers added together, how do i do this?

kind regards

Try this this.totalValue = this.items.reduce((sum, item) => sum + +item.qtyvalue, 0) — Hassan Imam
– Hassan Imam, Commented Jan 12, 2018 at 13:23

santosh singh · Accepted Answer · 2018-01-12 13:18:34Z

4

It's looks like your quantity is string not a number.You can try following code snippet

this.totalValue = this.items.filter((item) =>item.qtyvalue)
                            .map((item) => +item.qtyvalue)
                            .reduce((sum, current) => sum + current);
console.log(this.totalValue);

WORKING DEMO

answered Jan 12, 2018 at 13:18

santosh singh

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1 Comment

Sonny Hansen Over a year ago

The little + sign before item.qtyvalue made the whole thing work... i though i had tried every thing. Thanks man

Suren Srapyan · Accepted Answer · 2018-01-12 14:27:49Z

0

I think, your qtyvalue-s are strings, not numbers, so you get just them concatenated as strings. In the map function use parseFloat.

this.totalValue = this.items.filter(item => item.qtyvalue)
                            .map(item => parseFloat(item.qtyvalue))
                            .reduce((sum, current) => sum + current)

edited Jan 12, 2018 at 14:27

answered Jan 12, 2018 at 13:12

Suren Srapyan

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