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How to merge two different array of objects using JavaScript?
Suppose, we have two different array of objects that contains information about the questions answered by some people −
const arr1=[
{ PersonalID: '11', qusetionNumber: '1', value: 'Something' },
{ PersonalID: '12', qusetionNumber: '2', value: 'whatever' },
{ PersonalID: '13', qusetionNumber: '3', value: 'anything' },
{ PersonalID: '14', qusetionNumber: '4', value: 'null' }
];
const arr2=[
{ qusetionNumber: '2', chID: '111', cValue: 'red' },
{ qusetionNumber: '2', chID: '112', cValue: 'green'},
{ qusetionNumber: '2', chID: '113', cValue: 'blue' },
{qusetionNumber: '3', choiceID: '114', cValue: 'yellow'},
{qusetionNumber: '4', choiceID: '115', cValue: 'red'}
];We are required to write a function that groups this data, present in both arrays according to unique persons, i.e., one object depicting the question and choices for each unique person.
Therefore, the final output should look something like this −
const output = [{
personalID:11,
qusetionNumber:1,
value: 'Something'
},
{
personalID:12,
qusetionNumber:2,
value: 'whatever',
choice:[
{ qusetionNumber: '2', chID: '111', cValue: 'red' },
{ qusetionNumber: '2', chID: '112', cValue: 'green'},
{ qusetionNumber: '2', chID: '113', cValue: 'blue' }
]
},
{
personalID:13,
qusetionNumber:3,
value: 'anything',
choice:[
{ qusetionNumber: '3', chID: '114', cValue: 'yellow' }
]
},
{
personalID:14,
qusetionNumber:4,
value: 'null',
choice:[
{ qusetionNumber: '4', chID: '115', cValue: 'red' }
]
}];Example
The code for this will be −
const arr1=[
{ PersonalID: '11', qusetionNumber: '1', value: 'Something' },
{ PersonalID: '12', qusetionNumber: '2', value: 'whatever' },
{ PersonalID: '13', qusetionNumber: '3', value: 'anything' },
{ PersonalID: '14', qusetionNumber: '4', value: 'null' }
];
const arr2=[
{ qusetionNumber: '2', chID: '111', cValue: 'red' },
{ qusetionNumber: '2', chID: '112', cValue: 'green'},
{ qusetionNumber: '2', chID: '113', cValue: 'blue' },
{qusetionNumber: '3', choiceID: '114', cValue: 'yellow'},
{qusetionNumber: '4', choiceID: '115', cValue: 'red'}
];
const mergeArray = (arr1 = [], arr2 = []) => {
let i = -1;
const copy = arr1.slice();
copy.forEach(obj => {
const helper = [];
arr2.forEach(obj2 => {
if(obj.qusetionNumber == obj2.qusetionNumber){
i++;
helper.push(arr2[i]);
};
})
if(helper.length !== 0){
obj.choice = helper;
};
})
return copy;
};
console.log(JSON.stringify(mergeArray(arr1, arr2), undefined, 4));Output
And the output in the console will be −
[
{
"PersonalID": "11",
"qusetionNumber": "1",
"value": "Something"
},
{
"PersonalID": "12",
"qusetionNumber": "2",
"value": "whatever",
"choice": [
{
"qusetionNumber": "2",
"chID": "111",
"cValue": "red"
},
{
"qusetionNumber": "2",
"chID": "112",
"cValue": "green"
},
{
"qusetionNumber": "2",
"chID": "113",
"cValue": "blue"
}
]
},
{
"PersonalID": "13",
"qusetionNumber": "3",
"value": "anything",
"choice": [
{
"qusetionNumber": "3",
"choiceID": "114",
"cValue": "yellow"
}
]
},
{
"PersonalID": "14",
"qusetionNumber": "4",
"value": "null",
"choice": [
{
"qusetionNumber": "4",
"choiceID": "115",
"cValue": "red"
}
]
}
]
Updated on: 23-Nov-2020
381 Views
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