How Can I Easily Get an Array of JavaScript Object Keys?

Acquiring JavaScript Object Keys As Array

One requires JavaScript object keys to be present as an array, leading to the usage of loops as follows:

var foo = { 'alpha': 'puffin', 'beta': 'beagle' };
var keys = [];
for (var key in foo) {
    keys.push(key);
}

However, a simpler approach is available.

Using Object.keys

With the Object.keys method, the array of object keys can be obtained concisely:

var foo = { 'alpha': 'puffin', 'beta': 'beagle' };
var keys = Object.keys(foo);
console.log(keys) // ['alpha', 'beta']

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