Better JavaScript — Prototypes and Functions

Better JavaScript — Prototypes and Functions

All JavaScript objects inherit properties and methods from a prototype. ... Try it Yourself ». To add a new property to a constructor, you must add it to the constructor function: ... Examples might be simplified to improve reading and learning.

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.

Closures are Better than Strings for Encapsulating Code

We should never have code in strings.

If we need to run code, we should put them in a function.

For instance, if we have the repeat function, we should never write something like:

function repeat(n, action) {
  for (let i = 0; i < n; i++) {
    eval(action);
  }
}

eval is always bad because of security, performance, and scoping issues.

Instead, we should write:

function repeat(n, action) {
  for (let i = 0; i < n; i++) {
    action();
  }
}

Then we can use it by writing:

const start = [];
repeat(1000, () => {
  start.push(Date.now());
});

We passed in a callback so that we can run action in our function.

The code should never be in a string.

Instead, it should take a callback function and run it.

Don’t Rely on toString Method of Functions

The toString method doesn’t always return the source code of a function.

It does return the source code most of the time for functions we create.

So if we have:

(function(x) {
  return x + 2;
}).toString();

Then we get:

"function(x) {
  return x + 2;
}"

as a result.

technology web-development javascript programming software-development

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