Comparison Of Javascript And Logical Operators

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We first met operators when we were kids learning arithmetic in elementary school. Operators are the symbols between two operands. In web development, we use operators to compare two values ‚Äã‚Äãto determine if an expression is true or false. In this article, we’ll take a look at comparison (also known as relational) and equality operators - these are the two most common types of operators you’ll come across in JavaScript.

There will be times in the creative logic to solve problems where you will need to use comparison or relational operators to conditionally render something to the screen. Let’s take a look at the most common ones you’ll see in your code. Here is the object we will use for the next operators:

  1. in - use the in operator to see s’ there is a property in your object:
  1. instanceof - uses the instanceof operator to ask if an is an instance of a constructor class or function.
  1. Less than (<), Less than or equal to (<=) - A comparison operator that returns true in a conditional statement if operand A is less than operand B. We see this most often when we create a for loop:
  1. Greater than (>), Greater than or equal to (> =) - A comparison operator that returns true in a conditional statement if operand A is greater than operand B. It is used quite often to try to find the maximum number in an array:

Note: > = does not equal =>. The latter is used for large arrow functions in ES6 JavaScript syntax.

Equality operators

Similar to comparison operators, equality operators also return a Boolean value that declares whether an expression is true or not.

Equality (==) with respect to identity (===) - When we see signs of equality (=) In JavaScript, an equal sign is an assignment operator and not what we were used to when we were in math class.

Two equal signs are strictly an equality operator. It only checks if the values ‚Äã‚Äãare equal when trying to convert the values ‚Äã‚Äãto the other’s data type. This is called type coercion.

Similarly, if we see a bang / exclamation mark with an equal sign (! =) , known as the operator inequality, compare two values ‚Äã‚Äãto see if the operands are not equal in number. Don’t check the type.

In contrast, the identity operator, three equal signs (===) , checks type and number when comparing of the two values.

Like the inequality operator, the non-identity operator (! ==) checks whether operands are unequal. Also check the type. If they are, the condition is true and will return true. Otherwise, it will return false.



Final thoughts

Comparison and equality operators are essential for building logic in programming. When we compare the left operand with the right operand, we use the equality operators to see if the values ‚Äã‚Äãare of type equal, not type, type and number, or not type and number. Additionally, we use comparison operators to help with the logic that a user interface (UI) will render. When you are comfortable with these operators, check the logical operators, the ternary operator and the bitwise operators !

Ready for more JavaScript tutorials ?

Find out !

Ternary JavaScript operator: a step by step guide

JavaScript Switch Case: a step-by-step guide

JavaScript Syntax: A Beginner’s Guide

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We hope this article has helped you to resolve the problem. Apart from Comparison Of Javascript And Logical Operators, check other array Python module-related topics.

Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R.

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Frank Porretti

Berlin | 2023-03-21

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Angelo Danburry

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Boris Ungerschaft

Abu Dhabi | 2023-03-21

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