mongez-supportive-is-collections

Use the isEmpty predicate to check emptiness across JavaScript values. It applies nuanced rules for null, undefined, empty strings, zero values, maps, sets, and plain objects, distinguishing true emptiness across multiple data types for safer validation.

A plain object in JavaScript is specifically created via object literals or Object.create(null). The isPlainObject predicate checks for this exact shape, while isObject returns true for any object type including arrays, dates, and class instances minus null.

Use the isIterable predicate to check if a JavaScript value has a [Symbol.iterator] method. It identifies iterables including strings and collections without requiring heavy runtime dependencies.

Yes, these JavaScript object shape and emptiness predicates work with zero runtime dependencies. You can safely import isObject, isPlainObject, Is.array, isIterable, and isEmpty into your validation logic without adding extra package weight to your project.

To verify a value is a literal array and not an array-like object, use a strict array check predicate. The Is.array function returns true for literal arrays and false for array-like or other iterables, ensuring precise shape prediction for data validation.

Use isObject for JavaScript type checking when you need to validate any object type including arrays, dates, and class instances. Use isPlainObject when you specifically require the value to be a plain object literal or an object with a null prototype edge case.