Python's functools.partial() in JavaScript.
#!/usr/bin/env node
var functools = require('functools');
//using the log example from the python-docs
var log = function (msg, subsystem){
console.log(subsystem + ' : ' + msg);
}
var server_log = functools.partial(log, {subsystem : 'server'});
server_log('Unable to open socket');
// ofcourse, we can achieve what functools.partial does with a closure
var server_log_closure = function(msg){
return log(msg, 'server');
}
server_log_closure('Unable to open socket');
var func1 = function(a, b, c){ return a + b + c;};
var func2 = functools.partial(func1, { b : 4, c : 10 });
console.log(func2(20));
var func3 = functools.partial(func1, { a : 9});
console.log(func3(20, 1)); // =>
//works with anonymous functions too!
var func4 = functools.partial(
function(x, y){
return (x + y) * 3;
}, {y : 5}
);
console.log(func4(3)); // => (3 + 5) * 3 => 24Inspired by the partial function from Python's functools module
MIT License
2014, zikani