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Html – Js Array gives null

Why Array gives null outside script onclick event in htm5? The others variables works correctly. <!DOCTYPE html> <html> <head> <title>Array</title> <script> var list = new Array("andrea", "matteo", "marco"); var x = "andrea"; </script> </head> <body> <input type="button" value="click" onclick="alert(list[0]);"> </body>…

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Condition when a sequence of conditions within a Javascript forEach() method is not met

My IntersectionObserver uses a forEach method to call some functions if a condition is met per each item of an array: const sections = document.querySelectorAll("section") function removeHighlight(id) { someElementArray[id].classList.remove('highlight') } function addHighlight(id) { someElementArray[id].classList.add('highlight') } function onObserve(entries, observer) { entries.forEach((entry)…

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Javascript – Node JS: Loop round grouped by array

I've got data like this [ [ '@test','1.2.6-unstable' ], [ '@test','1.3.2-unstable' ], [ '@test','1.4.6-unstable' ], [ '@test2','4.0.1-unstable' ], [ '@test2','4.0.2-unstable' ], [ '@test2','4.0.3-unstable' ], [ '@test3','2.2.0-unstable' ], [ '@test3','2.2.3-unstable' ], [ '@test3','2.2.9-unstable' ], ... ] and I'm trying to group…

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