Combining multiple objects within the same array into one object

You can use like this Array.prototype.reduce

var resultObject = arrObj.reduce(function(result, currentObject) {
    for(var key in currentObject) {
        if (currentObject.hasOwnProperty(key)) {
            result[key] = currentObject[key];
        }
    }
    return result;
}, {});

console.log(resultObject);
# { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 }

      

        
        
        
      

    

This solution simply collects all the keys and their values ​​in each object in result

, which is eventually returned to us as a result.

This check

if (currentObject.hasOwnProperty(key)) {

      

        
        
        
      

    

we need to make sure that we don't include all inherited enumerated properties in the result.

If your environment supports then you can do the same in a concise manner like this Object.assign

const arrObj = [{a: 1, b: 2}, {c: 3, d: 4}, {e: 5, f: 6}];

console.log(arrObj.reduce(function(result, current) {
  return Object.assign(result, current);
}, {}));

// If you prefer arrow functions, you can make it a one-liner ;-)
console.log(arrObj.reduce(((r, c) => Object.assign(r, c)), {}));


// Thanks Spen from the comments. You can use the spread operator with assign
console.log(Object.assign({}, ...arrObj));