I’d like to start using ES6 Map instead of JS objects but I’m being held back because I can’t figure out how to JSON.stringify() a Map. My keys are guaranteed to be strings and my values will always be listed. Do I really have to write a wrapper method to serialize? Answer Both JSON.stringify and JSON.parse support a second argument.
Tag: dictionary
How to efficiently check if a Key Value pair exists in a Javascript “dictionary” object
Given: How to test if (1, 11) exists? Answer Most of the time very simply, with with one caveat: if the value you are looking for is undefined this will not do because it cannot distinguish between { 1: undefined } and just {}. In that case you need the more verbose test
Javascript equivalent of Python’s dict.setdefault?
In Python, for a dictionary d, sets d[‘key’] = value if ‘key’ was not in d, and otherwise leaves it as it is. Is there a clean, idiomatic way to do this on a Javascript object, or does it require an if statement? Answer It’s basically like using an if statement, but shorter: Or Update: as @bobtato noted, if the
How to create dictionary and add key value pairs dynamically in Javascript
From post: Sending a JSON array to be received as a Dictionary<string,string> I’m trying to do this same thing as that post, the only issue is that I don’t know what the keys and the values are upfront. So I need to be able to dynamically add the key and value pairs and I don’t know how to do that.