How Can I Efficiently Check if a Variable Equals One of Several Values?

Exploring Efficient Variable Equality Checking

When comparing a variable against multiple specific values, traditional methods can become cumbersome. The need for multiple equality checks or the creation of redundant object keys highlights the inefficiency of such approaches.

One solution that emerged was using a dictionary with the desired values as keys. However, this method introduced the need for explicit redundant values.

The Includes Method for Equality Checking

In ECMA2016, the includes method provides an elegant and efficient way to handle equality checks against multiple values. Supported by all major browsers, it eliminates the need for complex if/else statements or redundant object keys.

For example, to check if a variable foo is equal to any of the values 1, 3, or 12, you can use the following code:

This method simply checks if the value of foo is present in the array [1,3,12], returning true if a match is found and false otherwise. Its conciseness and browser compatibility make it an ideal solution for variable equality checking against multiple values.

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