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Sum Array of Objects
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| function sumArrayOfObjects(group, template = null) { | |
| let templateCopy = { ...template} | |
| var objectBuffer = {} | |
| var templateBuffer = {} | |
| if(template) { | |
| let keys = Object.keys(template) | |
| let values = Object.values(template) | |
| let filteredIndexes = values.map((value, i) => { | |
| if(value instanceof Object) { | |
| return i | |
| } | |
| }).filter(i => i != undefined) | |
| filteredIndexes.forEach(index => { | |
| templateBuffer[keys[index]] = values[index] | |
| }) | |
| } | |
| let reduced = group.reduce((acc, curr) => { | |
| let objectKeys = Object.keys(curr) | |
| let objectValues = Object.values(curr) | |
| let objectValueTypes = objectValues.map(val => typeof val) | |
| objectKeys.forEach((key, i) => { | |
| switch(objectValueTypes[i]) { | |
| case "number": | |
| if(template && acc[key] == undefined) { | |
| break; | |
| } | |
| if(acc[key] == undefined) { | |
| acc[key] = objectValues[i] | |
| } else { | |
| acc[key] += objectValues[i] | |
| } | |
| break; | |
| case "object": | |
| if(!template && templateBuffer[key] != undefined) { | |
| break; | |
| } | |
| if(objectBuffer[key] == undefined) { | |
| objectBuffer[key] = [objectValues[i]] | |
| } else { | |
| objectBuffer[key].push(objectValues[i]) | |
| } | |
| break; | |
| default: | |
| return | |
| } | |
| }) | |
| return acc | |
| }, templateCopy ?? {}) | |
| Object.keys(objectBuffer).forEach(objectKey => { | |
| let object = {} | |
| object[objectKey] = sumArrayOfObjects(objectBuffer[objectKey], templateBuffer[objectKey]) | |
| Object.assign(reduced, object) | |
| }) | |
| return reduced | |
| } |
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