node inline tests

classes.js

"use strict";

var type = require("core-util-is");
var slice = Array.prototype.slice;

// Return a className string from the given arguments
//
// Example:
//
// classes("foo", "bar") -> "foo bar"
// classes("foo", { bar: true, baz : false }) -> "foo bar"
module.exports = function() {
  return slice.call(arguments)
    // Parse objects
    .map(function(arg) {
      if (type.isObject(arg)) {
        return parseObject(arg);
      }
      return arg;
    })
    // Filter any falsey values
    .filter(Boolean)
    .join(" ");
};

function parseObject(obj) {
  return Object.keys(obj).reduce(function(acc, cur) {
    if (obj[cur]) {
      acc.push(cur);
    }
    return acc;
  }, []).join(" ");
}

// Tests
if (process.env.NODE_ENV === "test") {
  var classes = module.exports;
  var assert = require("insist");

  assert(classes("foo") === "foo");
  assert(classes("foo", "bar") === "foo bar");
  assert(classes("foo", false, "bar") === "foo bar");
  assert(classes("foo", "", "bar") === "foo bar");
  assert(classes("foo", undefined, "bar") === "foo bar");
  assert(classes({
    "foo": true,
  }) === "foo");
  assert(classes({
    "foo": true,
    "bar": true,
  }) === "foo bar");
  assert(classes({
    "foo": true,
    "baz": false,
    "bar": true,
  }) === "foo bar");
  assert(classes("baz", {
    "foo": true,
    "baz": false,
    "bar": true,
  }) === "baz foo bar");
}