Remove duplicate objects based on the same key from array and add their value to the object that is-CodePudding

Consider the following array of objects in javascript

const array = [
  { 10205: 2 },
  { 10207: 3 },
  { 10205: 2 },
  { 10207: 1 }
]

I would like to have it converted to

array = [
  { 10205: 4 },
  { 10207: 4 }
]

CodePudding user response：

Please use reduce function.

    const array = [
      { 10205: 2 },
      { 10207: 3 },
      { 10205: 2 },
      { 10207: 1 }
    ]
    
    console.log(Object.values(array.reduce((acc, el)=>{
        Object.keys(el).map((key)=>{
            acc[key] = {
                [key]: (acc?.[key]?.[key] ?? 0)   el[key],
            }
        })
        return acc;
    }, {})));

CodePudding user response：

const array = [{ 10205: 2 }, { 10207: 3 }, { 10205: 2 }, { 10207: 1 }];

const newArray = [];
array.forEach((element) => {
  const elementKey = Object.keys(element)[0];
  const foundIndex = newArray.findIndex((_) => Object.keys(_)[0] === elementKey);
  if (foundIndex >= 0) {
    newArray[foundIndex] =
        {[elementKey]: newArray[foundIndex][elementKey]   element[elementKey]};
  } else newArray.push(element);
});
console.log(newArray)