From the course: Visual Basic Essential Training
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Understand variable scope - Visual Basic Tutorial
From the course: Visual Basic Essential Training
Understand variable scope
- [Instructor] We haven't talked about variable scope or lifetime yet. So, I'll do that in this RunCode method. I'll start by talking about local variables meaning variables that are declared within a sub-routine or function. The scope of a variable determines its visibility to other code. So the visibility of a local variable like this one declared here on line 22 would be inside this sub. I can't use it before I declare it but once I've declared it, I can use it anywhere else in this sub-routine. I'm using it here on line 27, and on line 34. I'm also incrementing the value over here on line 28. So I can use it all the way down until I get to the End Sub. Rule number two, variables in the same scope cannot have the same identifier or name. Let's look at line 23. I'll uncomment this line. I get an error. So even though this is a different type and a different initialized value, because it has the same…
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Contents
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Work with variables and constants4m 56s
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Use the Code Explorer project1m 59s
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Declare a variable6m 30s
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Tips to make literals pop in the editor2m 34s
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Work with custom and built-in constants3m 54s
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Understand variable scope5m 42s
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Understand numeric to numeric conversions5m 54s
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Convert numeric values5m 43s
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Convert and format numbers to string6m 39s
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Convert and parse string to numbers5m 59s
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Work with strings7m 11s
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Work with dates and times9m 21s
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Challenge: Strings, dates, and parsing52s
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Solution: Strings, dates, and parsing2m 5s
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