Consider: I know the spread syntax. I searched about set, and I didn’t find an explanation about how it works. How can I set comparison of items and find similar items? If set, use a loop in the comparison. Answer Set can only contain unique values; here is what constitutes an equal value according to M…
Tag: javascript-objects
how to perform sum/minus operation on an array of objects, based on similar values(not properties) in an array of objects [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 2 years ago. Improve this question i hav…
Display Javascript Object In WebPage Without Knowing Its structure
I want to Display javascript document object in webpage, in the same way it is displayed in console as object opening as dropdown. Is there any way by which we can display a javascript object on webpage without knowing its structure in the same way as console does? Answer Check this out:
Ramda: How to remove keys in objects with empty values?
I have this object: I need to remove all key/value pairs in this object where the value is blank i.e. ” So the caste: ” property should be removed in the above case. I have tried: But this doesn’t do anything. reject doesn’t work either. What am I doing wrong? Answer You can use R.reje…
How can I filter nested objects and arrays with JavaScript?
My use case is something like this. I have an array that has an object. That each object has an array called menu Again that menu array has objected. That each object has an array dish_has_categories In dish_has_categories array, if there is an object with CategoryId is equal to 8 I want to filter out that ro…
How to compare a string with a value of an object in an array
I want to check if a string matches another string in an array of objects. Here’s my code Answer Since you’re clearly already using ES6, the most idiomatic way is using Array.includes after mapping the array:
How to use forEach method for objects in array in JavaScript?
Here is an array of donut objects. Directions: Use the forEach() method to loop over the array and print out the following donut summaries using console.log. I wrote this code but it doesn’t work : What’s wrong? Answer Instead of change it to You are looping through the donuts array and calling ea…
How do I filter out a key from an object?
I have following object in JS. How can I select all keys except the first financial_year and put it into a new empty object? I understand I can do something like obj[“mainline_revenue”] to select individual elements but its a long list and I don’t want to type elements keys individually. New…
Best way to handle undefined values in ReactJS?
I’m accessing an API with ReactJS. What is the best way to stop React Component crashing when it’s accessing a property in the object provided by the API that may be ‘undefined’? An example of an error is: TypeError: Cannot read property ‘items’ of undefined Answer It looks…
Create object from array
I want to create an object from a list inside an array. I have an array which is dynamic and supposed to look like this: var dynamicArray = [“2007”, “2008”, “2009”, “2010”]; And I want to make an object like this with some JavaScript ES6: Don’t worry about…