Return key and value in a Javascript object

Question

How would I go about returning the key and the value to a string or a smaller object:

 var whatIsInAName = [{ a: "a1", b: "b1" },{ a: "c1", b: "d1" },{ a: "e1", b: "f1" }];

returning something like: "a:a1"

I know about Object.values and Object.keys. Would it be some combination of this?

If you don't know the key, and there's no order in objects, how do you get the first one, and does it matter if it's the first one ? — adeneo
– adeneo, Commented Nov 10, 2016 at 17:13
Object.entries()?...Though I guess it's not official yet. Object.entries({foo:"FOO", bar: "BAR"}); This produces... [["foo","FOO"],["bar","BAR"]] — user1106925
– user1106925, Commented Nov 10, 2016 at 17:15
is whatIsInAName supposed to be the name of the function you want to return the key and value? Or is it supposed to be the object var name? — camiblanch
– camiblanch, Commented Nov 10, 2016 at 17:17

guest271314 · Accepted Answer · 2016-11-10 17:23:31Z

3

If interpret Question correctly, you can use Array.prototype.map(), JSON.stringify(), String.prototype.replace() with RegExp /[{}]/g and replacement string "", Array.prototype.join() with parameter ","

var arr = [{ a: "a1", b: "b1" },{ a: "c1", b: "d1" },{ a: "e1", b: "f1" }];

var res = arr.map(obj => JSON.stringify(obj).replace(/[{}]/g,""));

console.log(res.join(","))

answered Nov 10, 2016 at 17:23

guest271314

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