Conditionals

 

    Glish provides C-style if and if else conditionals:

if ( expression ) statement

if ( expression ) statement else statement

An if statement evaluates expression, converts the result to a boolean value, and if true executes statement.     if else is similar, executing statement if the value is true and statement if false. expression should evaluate to a   scalar value; if it is a vector then its first element is tested, though   in the future an error may be generated instead.

    As in most languages, a ``dangling-else" is associated with the nearest previous if, so

    if ( x )
        if ( y )
            print "x and y"
        else
            print "either not x or not y"

is interpreted as:

    if ( x )
        {
        if ( y )
            print "x and y"
        else
            print "either not x or not y"
        }

and not as:

    if ( x )
        {
        if ( y )
            print "x and y"
        }
    else
        print "either not x or not y"