babel-plugin-object-enumerables

Helps obtain an array of keys, values, and key/value pairs (what the spec calls “entries”) from an object, for the purposes of iteration or serialization. See the proposal for more details

Examples

// Given the current variables:
var results;
var iterSuper = {
  foo: 42
};
var iter = Object.create( iterSuper );
iter.bar = 43;

Object.enumerableKeys( O )

// Before
results = [];

for ( let x in iter ) {
  results.push( x );
}

results; // [ "foo", "bar" ]

// After
results = Object.enumerableKeys( iter );
results; // [ "foo", "bar" ] (same order as for loop)

Object.enumerableValues( O )

// Before
results = [];

for ( let x in iter ) {
  results.push( iter[ x ] );
}

results; // [ 42, 43 ]

// After
results = Object.enumerableValues( iter );
results; // [ 42, 43 ] (same order as for loop)

Object.enumerableEntries( O )

// Before
results = [];

for ( let x in iter ) {
  results.push( [ x, iter[ x ] ] );
}

results; // [ [ "foo", 42 ], [ "bar", 43 ] ]

// After
results = Object.enumerableEntries( iter );
results; // [ [ "foo", 42 ], [ "bar", 43 ] ] (same order as for loop)

Installation

$ npm install babel-plugin-object-enumerables

Usage

Via .babelrc (Recommended)

.babelrc

{
  "plugins": ["object-enumerables"]
}

Via CLI

$ babel --plugins object-enumerables script.js

Via Node API

require("babel-core").transform("code", {
  plugins: ["object-enumerables"]
});