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@dushujun
Created August 24, 2016 08:30
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ID - a unique ID/name generator for JavaScript
// Generate unique IDs for use as pseudo-private/protected names.
// Similar in concept to
// <http://wiki.ecmascript.org/doku.php?id=strawman:names>.
//
// The goals of this function are twofold:
//
// * Provide a way to generate a string guaranteed to be unique when compared
// to other strings generated by this function.
// * Make the string complex enough that it is highly unlikely to be
// accidentally duplicated by hand (this is key if you're using `ID`
// as a private/protected name on an object).
//
// Use:
//
// var privateName = ID();
// var o = { 'public': 'foo' };
// o[privateName] = 'bar';
var ID = function () {
// Math.random should be unique because of its seeding algorithm.
// Convert it to base 36 (numbers + letters), and grab the first 9 characters
// after the decimal.
return '_' + Math.random().toString(36).substr(2, 9);
};
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