I am working on Angular project and time to time I used to have check undefined or null over Object or it’s properties. Normally I use lodash _.isUndefined() see example below: I couldn’t see any problem with it. But I had discussion with my colleague during review of above code. He was telling me that if i gets undefined before
Tag: lodash
Sum all data in array of objects into new array of objects
I have an array of objects that looks like this: and I want to sum each element in the array to produce an array like this: I have used a map and reduce function but I was able to only sum an individual element like so: At the moment this produces a single value which is not what I want
Lodash reject point free
Is it possible to avoid point in this example? Answer Reject all items that are undefined or null using _.isNil():
Conditionally concatenate in reducer using lodash
I try to conditionally concat in my reducer, I have an array objects and I want to concatenate only if value not exist in my reducer. If value exists nothing must happen. I use lodash and I tried with _.uniqBy like this : This does not work. Example of my reducer jsFiddle linkk Required output : Because val1 ({id:1, name:’alex’})
Lodash _.set only if object exists
I am looking to set inner properties of an object only if they already exist. Lodash _.set will create the whole hierarchy if it does not exist. Is there an easy way to do this ? (Without and if statement ?) Snippet below: Answer The answer from Kalaiselvan A below put me on the way but this is not quite
Lodash: is it possible to use map with async functions?
Consider this code What addEnabledProperty does is to extend the object adding an enabled property, but this is not important. The function itself works well Is there a way to use _.map (or another system), to loop trough entire responseJson array to use addEnabledProperty against each element? I tried: But it’s not using async so it freeze the app. I
How to Import a Single Lodash Function?
Using webpack, I’m trying to import isEqual since lodash seems to be importing everything. I’ve tried doing the following with no success: Answer You can install lodash.isequal as a single module without installing the whole lodash package like so: When using ECMAScript 5 and CommonJS modules, you then import it like this: Using ES6 modules, this would be: And you
use Lodash to sort array of object by value
I am trying to sort an array by ‘name’ value (using Lodash). I used the Lodash docs to create the solution below however .orderBy doesn’t seem to be having any affect at all. Can anyone shed some light on the correct way to sort array? Chars Array Function Code Answer This method orderBy does not change the input array, you
Lodash – Find deep in array of object
I have an array of an object like this What I need is sum the property Val when prop is foo. So, I have to search through elements and get all objects where prop is foo. With this objects, I should sum the val property. I tried to use many combinations of _.find, _.pick and so on, but I don’t
Lodash group by multiple properties if property value is true
I have an array of vehicles that need to be grouped by make and model, only if the ‘selected’ property is true. The resulting object should contain properties for make model and count. Using lodash, how can I organize the vehicle objects into the desired result objects. I’m able to get the vehicle objects grouped by makeCode but I’m not