suppose we have an array of objects like this:
array = [{
amount: 1000,
cur: EUR
}, {
amount: 1500,
cur: GBD
}, {
amount: 2000,
cur: USD
}, {
amount: 2500,
cur: SSL
}]
Now I want to create a sum variable for this array which contains the sum of the amounts field whose cur isn't EUR and USD. To be more specific, I want a variable like sumOther which is equal to 1500 + 2500 = 4000. This variable contains the sum of the amounts whose cur is not EUR and USD.
You could just use a simple loop, testing the value of the cur on each iteration and adding to a total for the required values.
Or you could use the array .filter() and .reduce() methods:
var array = [
{amount: 1000, cur: 'EUR'},
{amount: 1500, cur: 'GBD'},
{amount: 2000, cur: 'USD'},
{amount: 2500, cur: 'SSL'}
]
var total = array.filter(function(v) { return !/EUR|USD/.test(v.cur) })
.reduce(function(acc, current) { return acc + current.amount }, 0)
console.log(total)Filter, reduce, and you're done.
var sumOther = array
.filter(y => y.cur != EUR && y.cur != USD)
.reduce((a, b) => a.amount + b.amount);
< ES6 version:
var sumOther = array
.filter(function(y) { return y.cur != EUR && y.cur != USD })
.reduce(function(a, b) { return a.amount + b.amount });
GBD with 'GBD' so it can be tested. But in my original example I used GBD as a variable, and not as string, just like you did in your question, that might've been the problem.You can use array map method
Hope this snippet will be useful
var sum = 0; // define a variable for adding amount
array.map(function(item){
// check if currency is not EUR or GBD, then update the sum
if(item.cur !=='EUR' && item.cur !=='GBD'){
sum = sum+item.amount
}
})
console.log(sum)
Example where excluded strings are not hard coded:
const array = [{amount: 1000, cur: 'EUR'},
{amount: 1500, cur: 'GBD'},
{amount: 2000, cur: 'USD'},
{amount: 2500, cur: 'SSL'}];
const exclude = ['EUR', 'USD'];
var sum = array.map(x => (!exclude.includes(x.cur)) ? x.amount : false)
.reduce((a, b) => a + b);
console.log(sum);
