Consider the array below:
[{a:1,b:1},{a:5,b:2},{a:10,b:2},{a:20,b:3}]
Is there a way to create a new array that merges elements with the same b value, while adding up the corresponding a values? The desired output should be as follows:
[{a:1,b:1},{a:(5+10),b:2},{a:20,b:3}]
An efficient way to achieve this is by utilizing a combination of Array.reduce and Array.find. Take a look at the code snippet below:
const mergedResults = dataToMerge.reduce((merged, current) => {
const existingItem = merged.find(item => item.id === current.id);
if (existingItem) {
existingItem.value += current.value;
} else {
merged.push(current);
}
return merged;
}, []);
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