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The syntax for the map() method is as follows: arr. map(function(element, index, array){ }, this); The callback function() is called on each array element, and the map() method always passes the current element , the index of the current element, and the whole array object to it.
The map() method returns an entirely new array with transformed elements and the same amount of data. In the case of forEach() , even if it returns undefined , it will mutate the original array with the callback .
. map() can be used to iterate through objects in an array and, in a similar fashion to traditional arrays, modify the content of each individual object and return a new array. This modification is done based on what is returned in the callback function.
You just need to wrap object in ()
var arr = [{
id: 1,
name: 'bill'
}, {
id: 2,
name: 'ted'
}]
var result = arr.map(person => ({ value: person.id, text: person.name }));
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