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forOwn

Iterates over own enumerable string keyed properties of an object.

let json = {
    "A": "1",
    "B": "2",
    "C": {
        "C1": "3",
        "C2": "4"
    },
    "D": [ "5", "6" ]
};

_.forOwn(json, (value, key) => {
    console.log(`key: ${key} - value: ${value}`);
});
// key: A - value: 1
// key: B - value: 2
// key: C - value: [object Object]
// key: D - value: 5,6