yielding

yielding

Easy generators.

Use Node version 0.11.x with --harmony-generators flag to work with es6 generators.

Installation

npm install yielding

Examples

var Y = require('yielding');

var b = Y(function* () {
    var a = yield 1;
    var b = yield 2;
    return a + b;
});

console.log( b() ); // 3

Async code:

var read = Y.nwrap(fs.readFile);

function* getContent(filename) {
    var content = yield read(filename, 'utf-8');
    console.log(content.length);
};

Y(getContent)('./examples/Y.js');

Working with promises:

var q = require('q');

var asyncFn = function(str) {
    var d = q.defer();
    setTimeout(function() {
        d.resolve(str);
    }, 1000);
    return d.promise;
};

Y(function* () {
    console.log(yield asyncFn('Hello'));
    console.log(yield asyncFn('World')); // 1 second later
})();

Creating promises from node functions:

Y.ncall(fs.readFile, './examples/Y.js', 'utf-8').then(function(content) {
    console.log(content.length);
});

Wrap node functions for later use:

var read = Y.nwrap(fs.readFile);

function* getContent(filename) {
    var content = yield read(filename, 'utf-8');
    console.log(content.length);
};

Y(getContent)('./examples/Y.js');