How do I use return to return values?
Lets say I have a function that runs through conditions, and if those conditions are met, it will return a value to be printed. In this case it is a function that checks the angle between two objects, like so:
(It returns nil. What's wrong with the script and how do I use return properly)?
01 | function angleInFront() |
02 | local lookVector = script.Parent.CFrame.LookVector |
03 | local otherVector |
04 | local angleBetween |
05 |
06 | for i,v in pairs(workspace:GetChildren) do |
07 | if v.Name == "Part" then -- and other conditions |
08 | otherVector = (v.Position - script.Parent.Position).Unit |
09 | angleBetween = math.deg(math.acos(lookVector:Dot(otherVector))) |
10 | if angleBetween < 90 then -- 90 degrees on either side from the front |
11 | return angleBetween |
12 | end |
13 | end |
14 | end |
15 | end |
16 |
17 | angleInFront() |
18 | print angleBetween |
1 answer
Explanation
01 | function angleInFront() |
02 | local lookVector = script.Parent.CFrame.LookVector |
03 | local otherVector |
04 | local angleBetween |
05 |
06 | for i,v in pairs(workspace:GetChildren) do |
07 | if v.Name == "Part" then -- and other conditions |
08 | otherVector = (v.Position - script.Parent.Position).Unit |
09 | angleBetween = math.deg(math.acos(lookVector:Dot(otherVector))) |
10 | if angleBetween < 90 then -- 90 degrees on either side from the front |
11 | return angleBetween |
12 | end |
13 | end |
14 | end |
15 | end |
16 |
17 | angleInFront() |
18 | print angleBetween |
It is supposed to return a nil value because obviously, you haven't defined the variable in line 04 which is actually fine.
Returning is the act of sending certain information back to where the function was called from..
Example 1
1 | function Onaddition(num1,num2) |
2 | local result = num1 + num2 |
3 | return result |
4 | end |
5 |
6 | local finalAnswer = Onaddition(2,2) |
7 |
8 |
9 | print(finalAnswer) |
The output prints 4.
Let's say if you remove the return result from the code. The output would print nilbecause returning can be also used for later purposes like storing something that you want to use for later purposes.
Example 2
1 | function Onaddition(num1,num2) |
2 | local result = num1 + num2 |
3 | end |
4 |
5 | local finalAnswer = Onaddition(2,2) |
6 |
7 |
8 | print(finalAnswer) |
The output prints nil because there is no return result in the code. I hope this helps you how to use return properly and please up vote this answer if it has helped you..
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