How can I sum values in an array of objects based on a specific condition?
[{amount:100, prefix:'a'},{amount:50, prefix:'b'},{amount:70, prefix:'a'},{amount:100, prefix:'b'}]
Is there a method to map and calculate the sums separately for 'a' and 'b' prefixes, resulting in totals of 170 for 'a' and 150 for 'b'?
def combine_amounts(list):
result = {}
for item in list:
if item['prefix'] in result:
result[item['prefix']] += item['amount']
else:
result[item['prefix']] = item['amount']
return result
print(combine_amounts([{amount:100, prefix:'a'},{amount:50, prefix:'b'},{amount:70, prefix:'a'},{amount:100, prefix:'b'}]))function calculate_prefix_sums(acc, current) {
if (acc[current['prefix']]) {
acc[current['prefix']] += current['amount']
} else {
acc[current['prefix']] = current['amount']
}
return acc;
}
const array = [{amount:100, prefix:'c'}, {amount:100, prefix:'a'},{amount:50, prefix:'b'},{amount:70, prefix:'a'},{amount:100, prefix:'b'}];
const result = array.reduce(calculate_prefix_sums, {});
console.log(result);My solution is similar to Ali's, but it can compute the sums for any given prefix, not just restricted to 'a' and 'b'.
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