get array of attribute from an array of objects

Question

Say i have an array of objects in javascript as

var array=[{id:1,message:"hello",time:"00-00-0000"},{id:2,message:"sup",time:"00-00-0000"},...];

What is the best way to get an array only containing the message attribute. i.e.

var messages=["hello","sup",...];

Niet the Dark Absol · Accepted Answer · 2014-03-10 11:52:20Z

8

The "best" way would be:

var messages = array.map(function(x) {return x.message;});

The most compatible way:

for(var messages=[],i=0,l=array.length; i<l; i++) messages[i]=array[i].message;

answered Mar 10, 2014 at 11:52

Niet the Dark Absol

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14 Comments

Nicky Smits Over a year ago

I never heard of the map function. Nice touch!

stranded Over a year ago

so i guess the only way to do this is to iterate through all objects, i was trying to find something better than that

Xotic750 Over a year ago

If you wanted to know the first or last word of every chapter in a book, you would have to do the same thing, go to each chapter and read the first or last word. How else would you do it?

Xotic750 Over a year ago

@naveed why point at documents for jQuery when this was clearly an ECMA5 method? developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…

stranded Over a year ago

@Xotic750 Sorry but I'm new to javascript and having only worked in c/c++, i thought it was possible because all you have to do is iterate through sizeof(object), like if your first string (char array with a fixed size in C) is at memory offset 10 and the sizeof the object is 100, then the second string will be at the offset 110, and the third at 210, but as the string over here has a dynamic size, so i guess that's not possible.

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CRABOLO · Accepted Answer · 2014-03-10 11:53:06Z

0

var messages = [];

for(var i = 0; i < array.length; i++) {
    messages.push(array[i][1]);
}

answered Mar 10, 2014 at 11:53

CRABOLO

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Comments

Bernd Wechner · Accepted Answer · 2021-07-29 10:32:51Z

0

A terser, more modern variant on @Niet the Dark Absol's solution is:

const messages = array.map(x => x.message);

answered Jul 29, 2021 at 10:32

Bernd Wechner

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