Check if an array is not empty

Return true for an array with at least one item.

JavaScript Version 1.0.0 · MIT · .md

function isNotEmpty(value) { return Array.isArray(value) && value.length > 0; }

Input & expected output

[
  "[email protected]"
]

true

The edge case

[]

false

Know the limits

• Uses length rather than Object.keys; the two differ only for sparse arrays, which JSON cannot express.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Check whether all values are equal — Compare every item with the first using Object.is.
• Check whether an object is empty — Check for own enumerable string keys on a JSON object.
• Check whether an integer is even — Test parity for safe integers, including zero and negative values.