In the Dart documentation, it states that we should not place const before initializing a const constructor, as the keyword is already implicit. However, can someone explain why the following codes exhibit different behaviors? class Person{ final List<String> names; const…
Update: I added more details of how I'm using the constants in response to questions. The actual problem I'm observing is that the constants are added to the global object, and so I'm worried about potential name collisions. I defined…
New to Javascript, I'm trying to adapt a script used to display SVG images, currently the script reads the values form within the script, I want to adapt this to read the values from a CSV, the issue I have…
I have the following table with a combo key columns CREATE TABLE IF NOT EXISTS MyTable ( ColumnID1 integer NOT NULL, ColumnID2 integer NOT NULL, ColumnName character varying(1000), CONSTRAINT "MyTable_pkey" PRIMARY KEY (ColumnID1, ColumnID2), CONSTRAINT "MyTable-ColumnID1-ColumnName-Unique-Key" UNIQUE (ColumnID1, ColumnName) )…
I was doing some javascript coding in chrome's console. When I do: console.log(x); let x; It gives "ReferenceError: x is not defined" But when I run the below code: let x; console.log(x); It consoles "undefined". Q1: Why is it happening?…
When I try to make a JavaScript program to create a responsive navigation menu, I get error message that I can't understand. When I write the code in Brackets, I get the error "Expected an identifier and instead saw 'const'.…
When creating a stateless widget, the constructor is const class MyWidget extends StatelessWidget { const MyWidget({super.key}); @override Widget build(BuildContext context) { return SingleChildScrollView( child: ListView( ), ); } } If I add a ScrollController(), then it is not a const…
I came across this article in which the author says that it's more performant defining a file with all SizedBox width and height constants that is going to be imported each time a SizedBox is needed. Is it true? Or…
When creating a flutter app in the dart language, a hint message is given to attach a const keyword in front of SizedBox. It is understood that attaching the const keyword increases execution speed by not performing unnecessary calculations at…
As far as I know, it is not possible to redeclare a const array. However when I declare arr inside the loop, it seems that arr is redeclare for each iteration. I don't understand this situation, does for loop create…