Contents
- 1 How to extract data from arrays and objects in JavaScript?
- 2 How to extract unique values from a list?
- 3 How to extract shared values between two columns?
- 4 How is destructuring used to extract data from arrays?
- 5 How to extrapolate object values inside an array?
- 6 How to extract a list from a data range?
How to extract data from arrays and objects in JavaScript?
In this blog, we are going to explore how to extract data from arrays and objects in javaScript using destructuring. JavaScript destructuring assignment is another feature deployed as a part of the ECMAScript release in 2015.
How to extract unique values from a list?
To extract unique values from the previous example using the LOOKUP function: We need to select cell F2. Assign the formula =LOOKUP (2,1/ (COUNTIF ($F$1:F1,$A$2:$A$9)=0),$A$2:$A$9) to cell F2.
The picture above shows two lists, one in column B and one in column D. The array formula in cell F3 extracts values that both lists have. In this case GG, HH, II and JJ is in both lists, see picture below.
Can a list of objects access the fields?
An object is a reference towards a memory address. Then, the fields of this objects are other references towards other memory addresses. Hence, a list of objects is a list of references. So, it’s impossible for the list to direclty access the object fields (references given by the references). The short answer is no.
How to extract more than one property from an array?
Above provided answer is good for extracting single property, what if you want to extract more than one property from array of objects. Here is the solution!! In case of that we can simply use _.pick (object, [paths])
How is destructuring used to extract data from arrays?
One of the new features is the ability of destructuring arrays and objects. This is an easy and convenient way of extracting data from arrays and objects. Let’s take a look at how it’s done, starting with the array. Say you got an array of names. Next, let’s use destructuring to extract data from the array.
How to extrapolate object values inside an array?
In general, if you want to extrapolate object values which are inside an array (like described in the question) then you could use reduce, map and array destructuring. This works as {foo, baz} on the left is using object destructoring and on the right side of the arrow is equivalent to {foo: foo, baz: baz} due to ES6’s enhanced object literals.
How to extract a list from a data range?
I created a sort code (number) based upon the three criteria that we need to have the data sorted by (a different date, numeric variety code and location ID) and when I look at the numbering system, the underlying logic is correct. My formula just doesn’t bring back the data in the actual sequential order.