In short, a var is null when it's not pointing anywhere. In the other hand, a var equal to "" is a defined var pointing to a variable which contains an empty string. That's essentially different. …

There are 3 ways to check for "not null". My recommendation is to use the Strict Not Version. 1. Strict Not Version if (val !== null) { ... } The Strict Not Version uses the Strict Equality …

Sep 5, 2017 · Here is how you can test if a variable is not NULL: if (myVar !== null) {...} the block will be executed if myVar is not null.. it will be executed if myVar is undefined or false or 0 or …

Sep 11, 2024 · Using the typeof operator, JavaScript checks if a variable is not null by verifying typeof variable !== ‘undefined’ && variable !== null. This approach ensures the variable exists …

Mar 2, 2024 · # Check if a Variable is Not NULL in JavaScript. Use the strict inequality (!==) operator to check if a variable is not null, e.g. myVar !== null. The strict inequality operator will …

How to Check for Null in JavaScript. Null represents an intentional absence of a value, indicating a variable has been declared but has yet to be assigned a value. These are some of the most …

Mar 13, 2025 · The strict inequality (!==) operator checks whether its two operands are not equal, returning a Boolean result. Unlike the inequality operator, the strict inequality operator always …

Mar 18, 2025 · Whether you choose to use the "!== null" operator, the "typeof" operator, the "null" keyword, the double exclamation mark, the ternary operator, or optional chaining, it's important …

Let‘s summarize the main techniques we learned for checking null values in JavaScript: Use strict equality checks === and !== against null for accurate null detection. Leverage the nullish …

Apr 25, 2013 · The only value that doesn't equal itself in JavaScript is NaN. If null === null is false, then your JavaScript engine has serious problems ;) To make sure your conditional statement …