Object.keys(), values(), entries()

These Object methods extract keys, values, or both from objects, enabling powerful transformations on JSON data.

Object.keys()

Returns an array of property names:

Object.values()

Returns an array of property values:

Object.entries()

Returns array of [key, value] pairs:

Object.fromEntries()

Convert entries back to object:

Practical Patterns

Exercise: Get Keys

Exercise: Sum Values

Exercise: Transform Entries

Key Points

• Object.keys(obj) → array of keys
• Object.values(obj) → array of values
• Object.entries(obj) → array of [key, value]
• Object.fromEntries(arr) → object from entries
• Combine with map/filter/reduce for transforms