我如何检查节点版本是否支持javascript方法

Question

I want to use reduce() javascript method in my node application. My node version is 4.2.6. How can I check if I can use this method without breaking my application.

Thank you.

Answer 1

支持它。您可以从http://node.green/#ES2015-built-ins-typed-arrays--TypedArray--prototype-reduce检查它

Answer 2

There are two approaches on how to test javascript methods supporting.

1. Compatibility tables.

For example, this one . Searching for Array methods rows, since the .reduce is a ES5 extension of the Array.prototype , we see that Node 4 supports it well. Node.geen tables also work. So, the particular answer for Node 4.2.6 is yes , it supports Array.prototype.reduce .

2. Manual check.

Also, depends on your needs, you may check it programmatically right in the code:

if (!Array.prototype.reduce) {
  // no .reduce()
}

This could be useful for example if you want to polyfill missing method manually.