How do I check for null values in JavaScript?

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#1

How do I check for null values in JavaScript?

#2

Hey Sndhu,

Using the strict equality operator (===):

let value = null; if (value === null) { console.log(“The value is null.”); } else { console.log(“The value is not null.”); }

This method uses the strict equality operator (===) to check if the value is exactly null. This is a precise check that doesn’t get confused by other falsy values like undefined or 0.

#3

Hey Sndhu,

Using the loose equality operator (==):

let value = null; if (value == null) { console.log(“The value is null or undefined.”); } else { console.log(“The value is neither null nor undefined.”); }

This method uses the loose equality operator (==) to check if the value is null or undefined. This can be useful if you want to treat null and undefined equivalently.

#4

Hey Sndhu,

Using the Object.is() method: let value = null; if (Object.is(value, null)) { console.log(“The value is null.”); } else { console.log(“The value is not null.”); }

The Object.is() method checks if the value is exactly null, similar to the strict equality check. It is more specific and can distinguish between different types of values, including NaN and -0.