Immutable-js: Get first key from OrderedMap

[Daniel15]

The .first() method returns the first _value_ in an OrderedMap. How do I get the first _key_?

[hufeng]

var Immutable = require('immutable');

var m = Immutable.OrderredMap({a:1, b:1});

//get first key
m.keySeq().first(); //a

[leebyron]

@hufeng is correct. Get the key sequence and pull the first item from it.

In a future major version update, I will likely change this API to return an entry tuple instead of a value, which adheres to Map's iteration behavior.

[justincui]

still not changed?

[haxxxton]

Would be great to get firstKey and lastKey options in the API, or have first and last return an entry tuple as discussed above :)