Why it says required?

Solar2D Lua Language
#1

Sory for bad english

display.newText( [parentGroup,] string, left, top, font, size )

display.newText( [parentGroup,] string, left, top, [width, height,] font, size )

In the corona’s api docs says that font and size in the text function are required, but i can throw them out when declare,why?

how this parametres are working? Are the arguments must be at right position of a list? or i can don’t remember their positions?

Thank you) english is my native language)

#2

Hi Sakendev.

What is the problem that you are facing?

#3

Lua can have optional parameters in the middle of the parameter list because the function checks for the type of objects being passed in.  So if the 4th parameter is a number, then it knows you’re passing in a width and height.  If it sees a string there like “Helvetica” or native.systemFont, then it knows you did not pass a width, height in and then processes it as a string, number for the font and size.

#4

Thanks to all

#5

Hi Sakendev.

What is the problem that you are facing?

#6

Lua can have optional parameters in the middle of the parameter list because the function checks for the type of objects being passed in.  So if the 4th parameter is a number, then it knows you’re passing in a width and height.  If it sees a string there like “Helvetica” or native.systemFont, then it knows you did not pass a width, height in and then processes it as a string, number for the font and size.

#7

Thanks to all