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<!doctype html>
<html lang="en">
<head>
<title>JavaScript Patterns</title>
<meta charset="utf-8">
</head>
<body>
<script>
/* Title: Namespace Pattern
Description: namespaces help reduce the number of globals required and avoid naming collisions or excessive name prefixing
*/
// unsafe
var MYAPP = {};
// better
if (typeof MYAPP === "undefined") {
var MYAPP = {};
}
// or shorter
var MYAPP = MYAPP || {};
MYAPP.namespace = function (ns_string) {
var parts = ns_string.split('.'),
parent = MYAPP,
i;
// strip redundant leading global
if (parts[0] === "MYAPP") {
parts = parts.slice(1);
}
for (i = 0; i < parts.length; i += 1) {
// create a property if it doesn't exist
if (typeof parent[parts[i]] === "undefined") {
parent[parts[i]] = {};
}
parent = parent[parts[i]];
}
return parent;
};
// assign returned value to a local var
var module2 = MYAPP.namespace('MYAPP.modules.module2');
console.log(module2 === MYAPP.modules.module2); // true
// skip initial `MYAPP`
MYAPP.namespace('modules.module51');
// long namespace
MYAPP.namespace('once.upon.a.time.there.was.this.long.nested.property');
</script>
</body>
</html>