This JavaScript snippet is a browser bookmarklet, which copies the active browser tab / page title and url as a markdown link into the clipboard. If some text is selected, it will copy the selection as a markdown quote. This is a hacky way to write javascript to write an entire script in one JavaScript line.

copy_page_link_as_markdown.js

javascript: [
    (() => [
        '[', document.title, ']', '(', window.location.href, ')', '\n',
        (window.getSelection().toString().trim())
            ? window.getSelection()
                    .toString()
                    .trim()
                    .split('\n')
                    .filter((line) => line.trim() !== '')
                    .map((line) => '  > ' + line)
                    .join('\n') + '\n'
            : undefined
    ].join('')),
    (window.navigator.clipboard)
        ? (content) => setTimeout(() => navigator.clipboard.writeText(content))
        : undefined,
].filter((item) => typeof item !== 'undefined')
.reduce((accumulator, item) =>
        typeof item === 'function'
            ? item(accumulator)
            : accumulator, 0);