rumplestiltskin

node-rumplestiltskin

Reveals an object's true name.

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Have you ever wanted to use an object as a key? If you know an object's true name you can.

You're probably thinking, "Oh great, an object hashing function." But that's not what this does. Rumplestiltskin gives you a consistent string representation for an object so you can use it as a key in a map.

Example

var trueName = require('rumplestiltskin').trueName;
 
var myMap = {};
 
function addToMap(key, val) {
    myMap[trueName(key)] = val;
}
 
function getFromMap(key) {
    return myMap[trueName(key)];
}
 
addToMap({ a: 1, b: '1' }, 'hello');
addToMap({ a: '1', b: 1 }, 'world');
 
console.log(getFromMap({ b: '1', a: 1 }));
console.log(getFromMap({ b: 1, a: '1' }));

True names are not cheap. The larger, more complicated an object is, the higher the cost. When you want to know if two objects are equal, use a deepEqual function do not compare their true names.

If you want a hash for objects, just feed true names into a hash function.

Salt

As a bonus, Rumplestiltskin can also accept a salt to prepend to the true name this can come in handy if you want to differentiate between identical objects.

To see a salt in action try using emaNeurt:

var emaNeurt = require('rumplestiltskin').emaNeurt;
 
console.log(emaNeurt({ hello: 'world' }));

Which basically does this: trueName(o, '\u202e');