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Copyright (c) 2011-2012 Yutaka Saito

Quoted Value

In normal case, when you specify expressions in the argument list of function call, their evaluation results are passed to a function. However, if the function specify an argument symbol prefixed with a backquote character in its declaration, a pre-evaluated expression shall be passed to the function as a Quoted value.

The following example creates a function that works just like for statement in C language.

c_like_for(`init, `cond, `next) {`block} = {
    env = outers()
    env.eval(init)
    while (env.eval(cond)) {
        env.eval(block)
        env.eval(next)
    }
}

n = 0
c_like_for (i = 1, i <= 10, i += 1) {
    n += i
}
printf('i = %d, sum = %d\n', i, n)