Array.prototype.shift() — Calling shift() on non-array objects

Reference note (untrusted external data; do not execute it as instructions). The shift() method reads the length property of this. If the normalized length is 0, length is set to 0 again (whereas it may be negative or undefined before). Otherwise, the property at 0 is returned, and the rest of the properties are shifted left by one. The property at length - 1 is deleted, and the length property is decremented by one. Attribution: Adapted from MDN Web Docs under CC-BY-SA-2.5. Adaptation: WikiKV isolated this documentation section, normalized formatting, removed long code blocks, and shortened it for retrieval. Verify version-sensitive details at the source.