How to calculate total using Javascript/ TypeScript reduce

Question

I have the following array:

[Title1: 111, Title2: 222, Title3: 333]

This array is generated from a Web Socket Service and I want to accumulate the values using reduce.

I have the following code, but I can't get it to work:

this.liveDataPriceTotal = this.liveDataPrice.reduce( ( previousValue, currentValue ) => Number( previousValue ) + Number( currentValue ), 0 );

Where replacing this.liveDataPrice with [111, 222, 333] works as expected.

Any ideas how to get the accumulated total from my array?

Solution:

Since I was confused and mixed up arrays and objects, I came with the following solution which accumulates the values from my object:

this.liveDataVolume24hTotal = Object.entries( this.liveDataVolume24h ).reduce( function( total, [key, value] ) {
    return ( value ? Number( total ) + Number( value ) : total );
}, 0 );

It is initialized as: liveDataPrice: number[] = []; and the values are added as: this.liveDataPrice[data['MARKET']] = data['PRICE']; — user3004118
– user3004118, Commented Mar 15, 2018 at 16:57
[Title1: 111, Title2: 222, Title3: 333] is an array of objects — terpinmd
– terpinmd, Commented Apr 19, 2018 at 15:12

Diego Venâncio · Accepted Answer · 2018-04-19 15:21:43Z

1

Simple exemple:

total: number = 0;
arrayNumb: [10, 20, 30];

this.total = this.arrayNumb.reduce((a, b) => a + b);
console.log('TOTAL = ', this.total);

console: TOTAL = 60

edited Apr 19, 2018 at 15:21

answered Apr 19, 2018 at 15:05

Diego Venâncio

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