LET Statement

LET var-name = value

LET array-name[(subscript)] = value

LET array-name[(subscript)] = array-name[(subscript)]

Assign a variable a value. LET can be omitted. The latest version of MyBASIC2 allows arrays with or without subscripts to be assigned a value or another array of the same size. In this case, size is the number of array elements an array can hold. For example, an array(3,3) has the same size as array(9) and you can make such an assignment. This can be useful in case you need to convert array dimensions.

When assigning a value to an array, you can omit subscripts from right to left. This is the same as replacing any subscripts omitted with the wild card character '*'. For example;

DIM array( 4, 3 ) AS REAL

LET array( 1 ) = 1 ' Is the same as...

LET array( 1, * ) = 1

Strong vs Weak Variable Typing

When using DIM to declare variables with OPTION EXPLICIT ON the typing is assumed to be strong and there are some limitations on how you can assign from one variable type to another. Main difference being that when strong is on, you can't assign a REAL to an INTEGER. See table below.

Strong Typing
Left Side Type	Right Side Type	Can Assign
Same	Same	Yes
REAL	INTEGER	Yes
HANDLE	INTEGER	Yes
INTEGER	REAL	No

Weak Typing
Left Side Type	Right Side Type	Can Assign
Same	Same	Yes
REAL	INTEGER	Yes
HANDLE	INTEGER	Yes
INTEGER	REAL	Yes

Examples:

' Basic value assignments

LET a = 1

b = 2

str = "Kalle Anka"

' Array examples

DIM nisse(2,3) AS INTEGER

DIM kalle(2,3) AS INTEGER

' Basic Array Assignments

LET nisse(1,1) = 8

LET nisse(1,2) = 8

LET nisse(1,3) = 8

' Initialize an array or part of an array

LET nisse = 1

LET nisse(*) = 1

LET nisse(*,1) = 1

LET nisse(*,2) = 2

LET nisse(*,3) = 3

LET nisse(2,*) = 2

' Copy one array to another or part of array

LET kalle = nisse

LET kalle(1,*) = nisse(1,*)

' Examples showing "slicing" one array

' into another using "Wild" indexes

DIM Arr(10,4,3) AS REAL

DIM Slice(10,2) AS REAL

DIM Vector(10,3) AS REAL

DIM One(10) AS REAL

LET Slice(*,1) = Arr(*,1,1)

LET One = Arr(*,4,1)

LET Vector(*,1) = Arr(*,2,1)

LET Vector(*,*) = Arr(*,2,*)

LET Vector = Arr(*,2)

LET Arr(*,2) = Vector

LET Arr(*,2,*) = Vector(*,*)