javascript-patterns/function-patterns/returning-functions.html at master · unbug/javascript-patterns

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<!doctype html>

<head>

<title>JavaScript Patterns</title>

</head>

<body>

/* Title: Returning functions

Description: one function returns another function or create another function on-demand

var setup = function () {

console.log(1);

return function () {

console.log(2);

};

// using the setup function

var my = setup(); // alerts 1

my(); // alerts 2

// Your setup function can store some private data in a closure and use that data somehow.

// Here setup() creates a counter function, which gives a next ID for example. But the count variable is not exposed.

var setup = function () {

var count = 0;

return function () {

return ++count;

};

// usage

var next = setup();

//next(); // returns 1

//next(); // returns 2

//next(); // returns 3

// reference

// http://www.jspatterns.com/returning-functions/

</script>

</body>

</html>