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ASK for LET Syntax(in Skill)

luanvn81
Hi everyone !

I’m trying to find out about commands that’s used for skillcode  writing. And I don’t understand “LET“command , who can explain this command for me ?

 

This is the Example( But I don’t understand anything)

*************************************************************************************

Ex1:

x = 5

let( ((x '(a b c)) y)

println( y ) ; Prints nil.

x)

=> (a b c) ; Returns the value of x.

 

Ex2:

procedure( test( x y )

let( ((x 6) (z "return string"))

if( (equal x y)

then z

else nil)))

test( 8 6 ) ; Call function test.

ð      "return string" ; z is returned because 6 == 6.

********************************************************************

(And this is about LET command)

let - SKILL mode

let(

l_bindings

g_expr1 ...

)

=> g_result

Description

Provides a faster alternative to prog for binding local variables only. This is a syntax form.

l_bindings is either a list of variables or a list of the form(s_variable g_value). The

bindings list is followed by one or more forms to be evaluated. The result of the let form is

the value of the last g_expr.

let is preferable to prog in all circumstances where a single exit point is acceptable, and

where the go and label constructs are not required.

Arguments

l_bindings Local variable bindings, can either be bound to a value or nil

(the default).

g_expr1 Any number of expressions.

Value Returned

ð     g_result The result of the last expression evaluated
Parents

  • Hi,

    Let delcares local variables within the scope included within its brackets. By default they are set to nil but you can assign a value as you have shown in your examples.

    While learning Skill I suggest that you do not assign values within the let statement.

    Your example 2 is, therefore, better written:

    procedure( test( x y )
     let( (z)
      z = "return string"
      if( (equal x y)
       then z
       else nil
      )
     )
    )

    Note that x is not included in the let statement variables because it has already been declared in the procedure variables.

Reply

  • Hi,

    Let delcares local variables within the scope included within its brackets. By default they are set to nil but you can assign a value as you have shown in your examples.

    While learning Skill I suggest that you do not assign values within the let statement.

    Your example 2 is, therefore, better written:

    procedure( test( x y )
     let( (z)
      z = "return string"
      if( (equal x y)
       then z
       else nil
      )
     )
    )

    Note that x is not included in the let statement variables because it has already been declared in the procedure variables.

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