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by mnemonik 4386 days ago
And for Firefox Developer Tools, we have the Scratchpad. I like ours better due to the keyboard shortcuts for eval/display/inspect/re-eval function/etc, but I may be biased ;)

https://developer.mozilla.org/en-US/docs/Tools/Scratchpad

Much of the new JS that I write these days starts as a scratchpad that I evolve over many iterations, right in the browser.