Results for “Object behavior & collections”
Small, practical examples. Search by task or narrow things down below.
Build an object from key-value entries
JavaScript: Object.fromEntries converts an iterable of pairs into ordinary own properties.
JavaScript✓ Tested
Build an object from key-value entries
TypeScript: Object.fromEntries converts an iterable of pairs into ordinary own properties.
TypeScript✓ Tested
List an object’s own enumerable keys
JavaScript: Object.keys omits inherited and non-enumerable properties.
JavaScript✓ Tested
List an object’s own enumerable keys
TypeScript: Object.keys omits inherited and non-enumerable properties.
TypeScript✓ Tested
Read an object’s own enumerable values
JavaScript: Object.values provides values without their corresponding keys.
JavaScript✓ Tested
Read an object’s own enumerable values
TypeScript: Object.values provides values without their corresponding keys.
TypeScript✓ Tested
Copy nested structured data independently
JavaScript: structuredClone creates an independent copy of supported structured values.
JavaScript✓ Tested
Copy nested structured data independently
TypeScript: structuredClone creates an independent copy of supported structured values.
TypeScript✓ Tested
Distinguish an own property from an inherited one
JavaScript: Object.hasOwn avoids depending on an object’s possibly shadowed hasOwnProperty method.
JavaScript✓ Tested
Distinguish an own property from an inherited one
TypeScript: Object.hasOwn avoids depending on an object’s possibly shadowed hasOwnProperty method.
TypeScript✓ Tested
Find members absent from another set
JavaScript: Negate a membership test to calculate the set difference.
JavaScript✓ Tested
Find members absent from another set
TypeScript: Negate a membership test to calculate the set difference.
TypeScript✓ Tested