he/him 
Is there a JS function that will turn [/a/, []] into "[/a/, []]"? JSON.stringify mangles regexes and toString() mangles arrays. > JSON.stringify([/a/, []]) '[{},[]]' > [/a/, []].toString() '/a/,'
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Nothing built-in. The closest is to use the map function on JSON.stringify and convert them to strings: JSON.stringify(VALUE, (key, value) => { if (value instanceof RegExp) { return `/${value.source}/${value.flags}`; } else { return value; } });
If you're using Node and are just using it for debug purposes then you can also use `require('util').inspect`.
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Inspect's whitespace handling is a problem for esoteric reasons, but it's good to know about both of these options for the future; thanks!
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(Err, I mean that inspect's whitespace handling is a problem for this particular application, where things need to match up tightly to some other existing data for Reasons.)
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