Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" name="checkbox_item[500]" />
<input type="checkbox" name="checkbox_item[10]" />
<input type="checkbox" name="checkbox_item[2]" />
<input type="checkbox" name="checkbox_item[1]" />
<input type="checkbox" name="checkbox_item[]" />

JavaScript

console.log($("input[type=checkbox][name^='checkbox_item']").length)

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JSFiddle - React, Tailwind, and code Playground

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JavaScript

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