Better JavaScript — Function Declarations in Blocks

Better JavaScript — Function Declarations in Blocks

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.

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.

Unportable Scoping of Block Function Declarations

We shouldn’t have function declarations inside a block.

This isn’t valid JavaScript but it’s still allowed by most JavaScript engines.

This is because we have problems with the results that it produces.

If we have:

function foo(x) {
  function f() {
    return "bar";
  }
  var result = [];
  if (x) {
    result.push(f());
  }
  result.push(f());
  return result;
}
console.log(foo(true));
console.log(foo(false));

technology web-development software-development javascript programming

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