[JavaScript] - What does !== mean in JavaScript? - SheCodes | SheCodes

[JavaScript] - What does !== mean in JavaScript?

Learn what the !== operator means in JavaScript and how it's used in conditional statements and comparisons.

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what does this mean !==

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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)

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