Creating an object array with a different type from an existing object array in Javascript

Question

Using lambdas and LINQ in C#, I can create a new collection with a certain type based on a collection with a different type. For instance:

var array = new List<Foo> { new Foo { name = "John", age = "21", title = "Mr." } };
// I can then use the Select function to create a collection with a different type
var modifiedArray = array.Select(foo => new Bar { title = foo.Title });

I was wondering if there is a better way to do this in Javascript. I currently have:

var array = [{name: 'John', age: '21', title: 'Mr.'}];
var modifiedArray = [];

array.forEach(function(foo){
    modifiedArray.push({title: foo.title});
});

Amit Joki · Accepted Answer · 2014-10-05 08:49:35Z

3

Yes. You can use Array.prototype.map

var modifiedArray = array.map(function(x){ 
    return {title: x.title} 
});

answered Oct 5, 2014 at 8:49

Amit Joki

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5 Comments

dimiguel Over a year ago

That is the fastest I have EVER seen someone reply on Stack Overflow. Thank you so much!

Amit Joki Over a year ago

@dimgl glad to have helped you :)

T.J. Crowder Over a year ago

@dimgl: Note that map was added in ES5, so it's not in older browsers like IE8. It can readily be shimmed, though.

dimiguel Over a year ago

@T.J.Crowder this is for a Node.js backend script

T.J. Crowder Over a year ago

@dimgl: Then you're fine.

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