javascriptnode.jsexpress-router

Better way to turn object with named booleans into array with their uppercase keys?

I'm trying to convert the methods part of an Express Router into a one-dimensional array of uppercase string words, so this:

layer.route.methods: { get: true, post: true }

into:

methods: ["GET", "POST"]

This is what I came up with, but isn't there a more subtle way?

const methods = [];
!layer.route.methods.get || methods.push('GET');
!layer.route.methods.post || methods.push('POST');
Solution

  • This can be achieved with a combination of filter (to get only the methods with true) and map (to capitalize).

    const methods = { get: true, post: true };

const result = Object.keys(methods).filter(method => methods[method]).map(method => method.toUpperCase());

console.log(result);