node.js无法运行Object.keys

Question

var list = {"you": 100, "me": 75, "foo": 116, "bar": 15};
keysSorted = Object.keys(list).sort(function(a,b){return list[a]-list[b]})
alert(keysSorted);     // bar,me,you,foo

from Sorting JavaScript Object by property value

I'm doing Object sorting. Above source working in Javascript. But not working in Node.js. I have an error like this.

keysSorted = Object.keys(list).sort(function(a,b){return list[a]-list[b]})
                    ^
TypeError: Object.keys is not a function

I don't know why. Please help me.

Answer 1

Most likely, you are using an out-dated Node.js version, v0.10 or v0.12. To check the version try running node -v .

This old version doesn't support Object.keys . You can check supported features for every Node.js versions here .

My advice is to update to Node.js version to 6.9.1. This version is current LTS (Long-term support).