Type-Checking(ish)

This is a small utility class that provides for quick checking of scalar values in JavaScript.

Usage

All of the code is in is.js. Because you can never theoretically know exactly how other future developers will choose to invoke your methods, I feel it's good practice to always check the types of values that have been passed into a method.

It contains a series of simple Boolean checks to determine whether a value is of a given type. These are then used as such (example shown is in React - but the same could be done in "regular" JavaScript):

import is from './is';
import React from 'react';

export default class Foo extends React.Component {
   iterateOverThisArray(appendMessageToOutput = '', array = []) {
      if (!is.anArray(array) || !is.aPopulatedString(appendMessageToOutput)) return;
      array.forEach(element => `${element} ${appendMessageToOutput}`);
   }

   render() {
      return null;
   }
}