how do i add a new property to an existing object in javascript?

what does setInterval(() mean?

Explain how == and === are different in JavaScript.

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how does return in JS work

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What does .length mean in javascript

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const toggleInfo = (index, event) => {
    setVisibleLightIndexes((prev) => {
      if (prev.includes(index)) {
        return prev.filter((i) => i !== index);
      } else {
        return [...prev, index];
      }
    });
const clickedElement = event.target.closest(".chauvetLights");
if (clickedElement) {
  clickedElement.classList.toggle("expanded");
}
 toggleBackgroundColor(event);
  };
TypeError: Cannot read properties of undefined (reading 'target')
    at k (home-OO3WpeNb.js:1:102576)
    at onClick (home-OO3WpeNb.js:1:104620)
    at Object.Em (index-h-qGlws7.js:38:9852)
    at km (index-h-qGlws7.js:38:10006)
    at Cm (index-h-qGlws7.js:38:10063)
    at Wa (index-h-qGlws7.js:38:31422)
    at fd (index-h-qGlws7.js:38:31839)
    at index-h-qGlws7.js:38:36751
    at Vs (index-h-qGlws7.js:41:36768)
    at Df (index-h-qGlws7.js:38:8988)

what does !== mean in javascript?

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Write a for loop that prints every third number from 0 up to and including 99 using console.log

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What is variable hoisting in javascript?

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Add a value attribute to both radio buttons. For convenience, set the button's value attribute to the same value as its id attribute.

Explain the difference between == and === in JavaScript

What does && mean in JavaScript

What is the .toLowerCase() function used for in JavaScript?

What is a variable in JavaScript?

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What is the difference between undefined and null in JavaScript?

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Can you explain JS functions return to me?

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How do I declare an array in JavaScript?

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What is the purpose of using the let keyword in JavaScript?

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What is a recursive function?

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What character defines or gives access to jQuery?