Difference between null and undefined in JavaScript 🚀
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✦ In JavaScript, null and undefined are special values that represent the absence of a value or object.
☆ undefined
• it's a property of the global object, and it is a value that is assigned to variables that have just been declared or to function arguments that have not been assigned a value.
• Example :
• it's a property of the global object, and it is a value that is assigned to variables that have just been declared or to function arguments that have not been assigned a value.
• Example :
☆ null
• null is a value that can be assigned to a variable as a representation of no value.
• It is an explicit representation of the absence of a value.
• Example :
let y = null;
console.log(y); // Output: null
• null is a value that can be assigned to a variable as a representation of no value.
• It is an explicit representation of the absence of a value.
• Example :
let y = null;
console.log(y); // Output: null
✦ It is important to note that null and undefined are not the same.
✦ undefined means a variable has been declared but has not been assigned a value, while null means a variable has been declared and has been assigned the value null explicitly.
✦ undefined means a variable has been declared but has not been assigned a value, while null means a variable has been declared and has been assigned the value null explicitly.
✦ We can use the typeof operator to determine the type of a value.
✦ The typeof operator will return "undefined" for variables that are undefined and "object" for variables that are null.
✦ Example :
✦ The typeof operator will return "undefined" for variables that are undefined and "object" for variables that are null.
✦ Example :
☆ Summary
• undefined represents the absence of a value, while null represents the absence of an object.
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• undefined represents the absence of a value, while null represents the absence of an object.
End thread 🧵
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