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Add property to common items in array and array of objects - JavaScript?
To add property, use map(). Let’s say the following is our array −
const firstname = ['John', 'David', 'Bob'];
Following are our array of objects −
const studentDetails = [
{
firstname: 'Carol',
marks: 78
},
{
firstname: 'Mike',
marks: 89
},
{
firstname: 'Bob',
marks: 86
}
];Example
Following is the code −
const firstname = ['John', 'David', 'Bob'];
const studentDetails = [
{
firstname: 'Carol',
marks: 78
},
{
firstname: 'Mike',
marks: 89
},
{
firstname: 'Bob',
marks: 86
}
];
const data = new Set(firstname);
const result = studentDetails.map(tmpObject => {
if (data.has(tmpObject.firstname)) tmpObject.isPresent ="This is present";
else
tmpObject.isPresent = "This is not present";
return tmpObject;
});
console.log(result);To run the above program, you need to use the following command −
node fileName.js.
Here, my file name is demo219.js.
Output
The output is as follows −
PS C:\Users\Amit\JavaScript-code> node demo219.js
[
{ firstname: 'Carol', marks: 78, isPresent: 'This is not present' },
{ firstname: 'Mike', marks: 89, isPresent: 'This is not present' },
{ firstname: 'Bob', marks: 86, isPresent: 'This is present' }
]
Updated on: 03-Oct-2020
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