Javascript array.find object by property value

Question

a) Is there any difference between the methods bellow (performance wise)?

b) Does this (.find) function iterates over all objects in the array?

c) Is there yet another syntax for this function?

#1 console.log(cres.find(o => o.name === refname));

#2 console.log(cres.find(function(o){return o.name===refname;}));

I'm looking for the most efficient way to find an object by it's property value in a large array. So, implementing a custom function (I.e:BTREE) would be a better approach?

Thx

UPDATE: Besides the "down vote". I've learned that the case in #1 is just a fancy notation for functions (Es6). So basically both cases are the same.

Anyways, It does not explains if the .find function iterates over all objects in the array and if that's the case a custom implementation would be more performatic...

https://stackoverflow.com/questions/44030645/are-arrow-functions-faster-more-performant-lighter-than-ordinary-standalone-f — epascarello, Sep 26 '17 at 00:00
@epascarello It's not necessary to test because I want find out a) which is the method used for the build in function and b) I've no knowledge of the es6 standard. So your comment and the down vote does not helped a lot.... — J. Doe, Sep 26 '17 at 00:15
Lol you said you wanted to know what was faster so you could have tested it. And the link I posted told you if they were different. — epascarello, Sep 26 '17 at 00:18
And if you would read the documentation for find you would know if it stopped or searched all. — epascarello, Sep 26 '17 at 00:18
In reality fastest would be to pre index everything and look it up by the key. — epascarello, Sep 26 '17 at 00:19
@epascarello It's ok man. please stop flooding the comments. — J. Doe, Sep 26 '17 at 01:34

score 1 · Accepted Answer · answered Sep 26 '17 at 00:05

1

a) / c) There is no difference, option 1 is just using ES6 syntax. You can checkout the docs here: http://es6-features.org/#ExpressionBodies

b) .find will iterate over the array until it finds a result then it will stop. Reference

answered Sep 26 '17 at 00:05

zlwaterfield

841
1
9
18

Thanx. Thats exactly what I was looking for. So now I have a direction to follow. – J. Doe Sep 26 '17 at 00:16

Javascript array.find object by property value

1 Answers1