lodash/lodash

A JavaScript utility library delivering consistency, modularity, performance, & extras.

julian-code

@julian-code

Hey guys. Is it possible to use intersectionBy with objects comparing two properties?

illuminist

@illuminist

@julian-code You can create iteratee that return a combinination of property, or use intersectionWith instead

julian-code

@julian-code

@illuminist yeah, i just tried that. However using _.isEqual is very costly.

      ctx.selectedPlayers.forEach((player) => {
        const comparableMatches = player.matches.map((match) => ({
          teamName: match.teamName,
          matchId: match.matchId,
          eloDiff: match.eloDiff,
          map: match.map,
          win: match.win,
          time: new Date(match.time),
        }));
        allMatches.push(comparableMatches);
      });
      return _.intersectionWith(...allMatches, _.isEqual);

illuminist

@illuminist

You should use your own comparator that compare between 2 properties

julian-code

@julian-code

what is send in after the ...allMatches?

As the second argument.

illuminist

@illuminist

That's the comparator

Its signature is (object1, object2) => boolean

julian-code

@julian-code

arhhh

I think I got it working now :D

illuminist

@illuminist

That's great

julian-code

@julian-code

 return _.intersectionWith(...allMatches,
        (match1, match2) => {
          if (match1.win === match2.win && match1.matchId === match2.matchId) {
            return true;
          }
          return false;
        });

Thanks for the help :)

illuminist

@illuminist

Glad too

julian-code

@julian-code

How do you find and set a value on a specific object in an array?

Or more like find a specific object and set a value on that object.

illuminist

@illuminist

Use findIndex to get index of object in an array then use that index to set object value

Alexander Sivashev

@shyr1punk

Hi. I'm interesting what community think about a this proposal: memoize: Warning: for memoized function with 2+ args use resolver lodash/lodash#4641 implemented here lodash/lodash#4702
If you like it, please send a reaction in issue or comment or suggest changes/help with implementation

julian-code

@julian-code

Hey guys. I need to loop through an array calculating the difference between current element and next element. Such as this in a for loop:
eloDiff: Number(x.elo) - Number(data[index + 1].elo),

Can you use some of lodashes functions to do the same?

julian-code

@julian-code

It should iterate over current and next.

SOULE Théo

@XxSven_gitlab

Hello, I have a little question about how lodash is delivered. The syntax is ;(function() {}.call(this)); yet on stackoverflow I can only found explanations for (function () {}).call(); the parenthesis is not at the same place

can someone please explain to me what is happening here as I am a beginner ?

illuminist

@illuminist

@XxSven_gitlab Those get evaluated to be the same, ultimately they become function () {}.call(this).

SOULE Théo

@XxSven_gitlab

@illuminist But when I write this in js fiddle I get syntax error if I don't surround it by parenthesis

illuminist

@illuminist

(function () {}) this one get boiled down into function object first before accessing .call, while (function () {}.call(this)) is an entire expression for function call

It isn't an usual syntax that you use in everyday job, but still good to know

SOULE Théo

@XxSven_gitlab

ok ty, it's weird ^^'

NursahKara

@NursahKara

hello, I am new in lodash so i don't know how to use with react native. I have a question. I have a project which is related to firebase. I want to see the information of which user logs in.With the map function, I can access all the data in the database but I only want to see the data of the logged-in user.should I use the find function to achieve this?Do you have a suggestion?

I want to use currentUser.email

illuminist

@illuminist

What is the shape of your state.profileInfomationList?

NursahKara

@NursahKara

it is an array

illuminist

@illuminist

What is the shape of object inside of the array?

NursahKara

@NursahKara

email name surname nick birthday

illuminist

@illuminist

So you want to find an object with email that match currentUser?

NursahKara

@NursahKara

yes

illuminist

@illuminist

Then it is better to use _.find to get one object from the array

NursahKara

@NursahKara

i think so too but i couldn't use it with react native

I can pull all the data with the map function, but it gets confused when I use the find function.

illuminist

@illuminist

It should not be difference from usual javascript regardless of what platform

NursahKara

@NursahKara

thanks your time @illuminist

WebAzOps

@WebAzOps

Selam kervan

thoo1

@thoo1

Does anyone know how _.isEqual treats date objects?

Does it compare using ===, or date1.getTime() === date2.getTime(), or some other way?

Reason I ask is because in my code, I am debugging, I am seeing that the two date objects I am comparing using _.isEqual is returning false even though the .getTime() for both dates are the same

Toom

@ProditorMagnus

is https://github.com/lodash/lodash/blob/4.12.0/lodash.js#L454 correct place where I need to fix #2238?

Toom

@ProditorMagnus

staying with that then

Zach Reedy

@DatZach

Hello, I'm working on a port of Lodash for the latest version of GameMaker which now supports functions as a first class citizen and structs (which emulates JS Objects). I was wondering if someone know who I should contact to determine what is permissible as far as naming and licensing, as this is derived from the Lodash API. There's some features that've been omitted as they don't make sense in GML. Additionally, none of Lodash's codebase has been utilized, it's purely the API definitions.

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