Coercion and Chaining in Javascript

Coercion and Chaining in Javascript

In this article, we’ll look at ways to improve our JavaScript code.

Like any kind of apps, JavaScript apps also have to be written well.

Otherwise, we run into all kinds of issues later on.

In this article, we’ll look at ways to improve our JavaScript code.

No Excessive Coercion

There should be no excessive data type coercion in our app.

JavaScript is very loose with types, so it coerces data types all the time.

Coercion may be convenient, but it’s easy to produce unexpected results since the rules are hard to remember.

Coercion is confusing when we work with overloaded function signatures.

So if we have:

function foo(x) {
  x = Number(x);
  if (typeof x === "number") {
    //...
  } else {
    //...
  }
};

We converted x to a number before running the rest of the code, so the type of x is always a number.

The else block will never be executed before of the coercion.

If we overload a function by checking the type of the parameter, then we shouldn't coerce the data type.

software-development programming technology web-development javascript

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