In case you’ve encountered the “jquery.min.js:2 Uncaught TypeError: Can not learn properties of undefined (studying ‘kind’)” error, you’re doubtless attempting to entry a property of an object that’s undefined. This error happens while you attempt to entry a property of an object that’s undefined or null.
This information will talk about some steps that can assist you debug and repair this error.
Let’s get began!
Listed below are some steps you may take to troubleshoot and repair this error:
- First, examine the article you’re attempting to entry. And ensure the article you’re attempting to entry exists and isn’t undefined or null. Subsequent, you may add a console.log assertion to print out the article and see whether it is outlined.
- Examine your code for typos: Ensure you have typed the property identify appropriately. Typos may cause this error, so double-check your code to make sure you have spelled every little thing appropriately.
- Guarantee the article has the property you’re attempting to entry. This error will happen if the article doesn’t have the property you’re attempting to entry. Guarantee the article has the property you’re attempting to entry earlier than attempting to entry it.
- Examine for asynchronous points. In case you’re utilizing asynchronous code, similar to with AJAX requests, guarantee that the article you’re attempting to entry is accessible while you attempt to entry it. Asynchronous code can typically trigger points with object availability, so deal with these instances appropriately.
Following these steps, you must be capable of troubleshoot and repair the “jquery.min.js:2 Uncaught TypeError: Can not learn properties of undefined (studying ‘kind’)” error.
Good JavaScript practices
Listed below are some glorious JavaScript practices to keep away from undefined properties:
- Examine the article’s kind: Earlier than accessing an object property, guarantee that the article is outlined and never null by utilizing the typeof operator to examine if the article is outlined and the !== operator to examine if it isn’t
null. For instance:
if (typeof obj !== 'undefined' && obj !== null) {
// entry obj properties right here
}- Set default values: If uncertain if an object property will likely be outlined, use the || operator to set a default worth. For instance:
let worth = obj.property || 'default';This will likely be set to the worth of the obj.property whether it is outlined and to ‘default’ if it isn’t.
- Use elective chaining: Beginning with ECMAScript 2020, you should utilize elective chaining to entry an object property safely. This lets you entry a property of an object that could be safely undefined or null with out throwing an error. For instance:
let worth = obj?.property;It will set the worth to the worth of the obj.property whether it is outlined and never null and to undefined if it isn’t.
ECMAScript is a standardized model of JavaScript. Subsequently the syntax and performance of ECMAScript code will likely be much like that of JavaScript code. As well as, most trendy browsers, together with Google Chrome, help the newest model of ECMAScript (ES2020).
Wrapping Up
You now know the right way to troubleshoot the “Can not learn properties of undefined (studying ‘kind’)” error. As well as, you know the way to stop it from occurring sooner or later.
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