JavaScript Algorithm: Is the Number Less than or Equal to Zero?

(Beginner) Simplify Complex Logic with Easy Conditional Checks

Photo by Jeremy Perkins on Unsplash

Evaluating logic conditions is central to JavaScript programming. A common need is checking if a given number meets some criteria, such as being less than or equal to zero.

In this quick tutorial, we’ll create a reusable function for precisely that.

The key ideas are:

1. Accept number as a parameter
2. Compare to 0 using less than or equal (<=)
3. Return true or false

Here is the full function:

function checkIfZeroOrLess(number) {
  if (number <= 0) {
    return true; 
  } else {  
    return false;
  }
}

Example usage:

checkIfZeroOrLess(5)   // false 

checkIfZeroOrLess(-2) // true

Why conditionally check numbers?

• Simplifies complex logic flows
• Allows elegant control mechanisms
• Abstracts core programming concept

Now you can cleanly encapsulate the common task of evaluating if a number meets criteria. This makes business rules, validation, error handling and more much simpler!

Let me know how this function helps reduce complexity in your projects. What other conditional checks do you find essential when programming with JavaScript? Share your thoughts!