Compare Two Array, if found same key get the value from 2nd Array

Question

How to compare two arrays, and if found the same key and then get the value from 2nd array and assign it to first array. And the result is using first array. for example I have the array below:

    var compareit = {
            firstArray : {
                'color': 'blue',
                'width': 400,
                'height': 150,
            },
            secondArray: {
                'color': 'red',
                'height': 500,
            },
    };

The goal is, I want the result will : {'color': 'red', 'width': '400', 'height': '500'};

I really appreciate with any help...Thank you :)

Satpal · Accepted Answer · 2017-02-13 10:13:05Z

1

You can just use Object.assign() to copy values from one or more source objects to a target object.

 var compareit = {
   firstArray: {
     'color': 'blue',
     'width': 400,
     'height': 150,
   },
   secondArray: {
     'color': 'red',
     'height': 500,
   },
 };

 Object.assign(compareit.firstArray, compareit.secondArray);
 console.log(compareit.firstArray)

If you don't want to manipulate existing object compareit.firstArray

var compareit = {
  firstArray: {
    'color': 'blue',
    'width': 400,
    'height': 150,
  },
  secondArray: {
    'color': 'red',
    'height': 500,
  },
};

var obj = {};
Object.assign(obj, compareit.firstArray, compareit.secondArray);
console.log(obj, compareit)

edited Feb 13, 2017 at 10:13

answered Feb 13, 2017 at 10:07

Satpal

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Barmar · Accepted Answer · 2017-02-13 10:08:15Z

1

You can loop through the properties in the first array, and check if the same property exists in the second array.

var compareit = {
  firstArray: {
    'color': 'blue',
    'width': 400,
    'height': 150,
  },
  secondArray: {
    'color': 'red',
    'height': 500,
  },
};
var result = {};
for (var key in compareit.firstArray) {
  if (key in compareit.secondArray) {
    result[key] = compareit.secondArray[key];
  } else {
    result[key] = compareit.firstArray[key];
  }
}
console.log(result);

answered Feb 13, 2017 at 10:08

Barmar

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Comments

LellisMoon · Accepted Answer · 2017-02-13 10:10:21Z

0

var compareit = {
            firstArray : {
                'color': 'blue',
                'width': 400,
                'height': 150,
            },
            secondArray: {
                'color': 'red',
                'height': 500,
            },
    };
var result,
    compareObjects=function(comp){
      return Object.assign(comp.firstArray, comp.secondArray);
    };

result=compareObjects(compareit);
console.log(result);

answered Feb 13, 2017 at 10:10

LellisMoon

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