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If the purpose of the if statement is to check for null or undefined values before assigning a value to a variable, you can make use of the Nullish Coalescing Operator. According to the data from caniuse, it should be supported by around 85% of the browsers(as of January 2021). An example of the operator is shown below: const a = some_variable ??
To check for null SPECIFICALLY you would use this: if (variable === null) This test will ONLY pass for null and will not pass for "", undefined, false, 0, or NaN. Additionally, I've provided absolute checks for each "false-like" value (one that would return true for !variable).
29 lis 2022 · How to Check for Null in JavaScript with Equality Operators. The equality operators provide the best way to check for null. You can either use the loose/double equality operator (==) or the strict/triple equality operator (===).
7 lip 2022 · The best way to check for null is to use strict and explicit equality: console.log (leviticus === null) // trueconsole.log (dune === null) // false. How to Check for Null with the Object.is () Method. An equally foolproof way to check for null is to use the built-in Object.is () method:
28 cze 2023 · One way to check for null in JavaScript is to check if a value is loosely equal to null using the double equality == operator:
7 maj 2023 · Checking for an empty, undefined, or null string in JavaScript involves verifying if the string is falsy or has a length of zero. To check for empty, undefined, or null strings in JavaScript, use conditional statements, string comparison methods, or the typeof operator
Check if a value is null. To check if a value is null, you use the strict equality operator === like this: value === null Code language: JavaScript (javascript) For example: const rect = null; const square = { dimension: 10}; console.log(rect === null); // true console.log(square === null); // false Code language: JavaScript (javascript)
