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Understanding the Sketchware blocks- List



The List and listview

One of the most powerful tools in building apps is the listview. This is the key feature used to create chat applications, accounting apps, notes apps, directories and so much more. There are three types of lists:

1. Number list
2. String list
3. Map list



1. Number List

A number list is one that contains only numerical values. e.g. 1, 2, 3, 4, 5. This type of list would be ideal if I'm building a datepicker or a timer app which stores mainly numbers

2. String list

A string list can contain numbers, letters and other special characters. e.g. a list of country names like Australia, Brazil, Canada and so on. This can be used together with a spinner to let the user choose their location. If you're creating a simple app that collects user names and nothing else then this might do.

3. Map List
A map list is one that contains numerous keys with different data at each position e.g. Date, Name, Age, Sex. This coupled with firebase can create a group chat or one to one chat app that will store the username, message text and time sent. It can also be used to create accounting apps which record transactions and collect date, details, reference number and amount. It can also be used to create a notes app or a journal which stores date, text and other details. For those that are working on finance apps or anything that allows a user to enter and save data to a database then this is your go to tool. If you're building a game then you can use a listmap to store the usernames and high scores. 

As stated in one of the earlier tutorials, there's no right way or wrong way to come up with logic. 1+1 is 2 and so is 3-1 or 10÷5. So it's all up to you to decide what works best for you and suits your app best. As I was explaining the different types of lists I'm sure you got a few ideas on which one would work best for a specific part of your app. Try it out.

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Comments

Mangeh Destiny Emmanuel said…
I'm actually loving this.
28 April 2022 at 08:07
Unknown said…
Hello brother ! Would explain hw to create more block all types an custom parameter pleaz
1 November 2022 at 05:42
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