Question

Possible Duplicate:
best way to get the key of a key/value javascript object

foo = {bar: “baz”}

How do you get a listing of all the properties and values within foo?

Answer 1

A for in loop can give you the key and value. Remember to use const, let or var for variable declaration in strict mode.

for(const p in foo) {
    console.log (p, foo[p])
}

From the console:

foo = {bar: "baz"}

Object
bar: "baz"
__proto__: Object

for(p in foo) { console.log (p, foo[p]) }
> bar baz

If the object you’re looping over has has inherited properties from its prototype, you can prevent the inherited properties from being looped over using the Object.hasOwnProperty() function like this:

for(const p in foo) {
    if (foo.hasOwnProperty(p)) {
        console.log (p, foo[p])
    }
}