React.isValidElement
Knowing what input type you've received is hugely important in JavaScript, which is a big reason for Flow and TypeScript's rise. One such case where it's useful to know what an object represents is if the input is a string or a React element.
To detect if an object is a React element, you can use React.isValidElement(obj):
// Add a wrapping DIV if the content isn't a React element
// PropTypes.oneOfType([PropTypes.string, PropTypes.element])
render() {
const { content } = this.props
React.isValidElement(content)) ?
content :
{content}
}
I really like that React.isValidElement allows us to create flexible elements that accept React elements or strings; hugely useful in generic components like modals, alerts, and everywhere else!
![JavaScript Promise API]()
While synchronous code is easier to follow and debug, async is generally better for performance and flexibility. Why "hold up the show" when you can trigger numerous requests at once and then handle them when each is ready? Promises are becoming a big part of the JavaScript world...
![Regular Expressions for the Rest of Us]()
Sooner or later you'll run across a regular expression. With their cryptic syntax, confusing documentation and massive learning curve, most developers settle for copying and pasting them from StackOverflow and hoping they work. But what if you could decode regular expressions and harness their power? In...
![Create Spinning, Fading Icons with CSS3 and MooTools]()
A goal of my latest blog redesign was to practice what I preached a bit more; add a bit more subtle flair. One of the ways I accomplished that was by using CSS3 animations to change the display of my profile icons (RSS, GitHub, etc.) I...
![Create a NoScript Compatible Select Form Element with an onChange Event]()
I wouldn't say that I'm addicted to checking Google Analytics but I do check my statistics often. I guess hoping for a huge burst of traffic from some unknown source. Anyway, I have multiple sites set up within my account. The way to...
