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Conditionals

Glish provides C-style if and if ... else conditionals:

if ( expression ) statement

if ( expression ) statement₁ else statement₂

An if statement evaluates expression, converts the result to a boolean value, and if true executes statement. The if ... else statement is similar, executing statement₁ if the value is true and statement₂ if false. The 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"

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