Object object operation

Function

The Object prototype function provides key-value enumeration, JSON stringification, deep copy, merge, filter, clipping and high-order traversal capabilities.

API List

API	Description
Object.len	Returns the number of key-value pairs of the object itself.
Object.to_string	Serialize an object to a JSON string.
Object.keys	Returns an array of object key names.
Object.values	Returns an array of object values.
Object.entries	Returns an array of entries in the form [key, value].
Object.reverse	Returns a new object with the key order reversed.
Object.concat	Consolidate one or more objects into a new object.
Object.clone	Returns a deep copy of the object.
Object.delete	Delete the specified key.
Object.has_key	Determine whether the specified key exists in the object.
Object.get	Read the specified key and return the default value if missing.
Object.is_empty	Determine whether the object is empty.
Object.from_entries	Create an object from an array of [key, value] entries.
Object.each	Traverse object key values and execute callbacks.
Object.map	Traverse the object and write the callback return value into the new object.
Object.filter	Filter the key-value pairs that make the callback result true.
Object.every	Determine whether all key-value pairs make the callback result true.
Object.some	Determine whether there is a key-value pair for the callback result to be true.
Object.find	Returns the first value that makes the callback result true.
Object.find_key	Returns the first key for which the callback result is true.
Object.update	Merge one or more objects into the current object in place.
Object.pick	Select a field by key name and return a new object.
Object.omit	Exclude fields by keyname and return a new object.
Object.clear	Clear the object and return the original object.

Examples

Notes

Objects maintain insertion order.
clone, reverse, concat, map, filter, pick, omit, from_entries return new objects; delete, update, clear will modify the original object.