Using $Z

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Added by Barbara Weinstein, last edited by Barbara Weinstein on Mar 04, 2010 (view change)

$Z is another useful utility method that is similar to $Y. Like $Y, it returns a wrapping function that conforms to the contract of an asynchronous function. (The wrapping function always returns an instance of jsx3.$AsyncRV.) Unlike $Y, $Z enforces no contract on the wrapped function. jsx3.$Z allows you to use automatic parameter resolution and return value chaining with normal, synchronous functions, as in the following example:

function add(a, b) { return a + b; }

var firstArg = jsx3.$Y(function(cb) {
    cb.done(cb.args()[0]);
});

var one = firstArg(1), two = firstArg(2);
jsx3.$Z(add)(one, two).when(function(rv) {
    jsx3.log("1 + 2 = " + rv);
});

Designing Asynchronous Functions

Chapter 21 Asynchronous Programming Utilities

Asynchronous AMP APIs

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Using $Z

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