🔸array length
JS ⟩ object ⟩ built-in ⟩ Array ⟩ length
array length is automatically maintained by the array.
if you assign
a[i] = value, where i ≥ a.length, a.length is set toi+1.if you set
a.length = n, where n < a.length, then any elements whose index ≥ n are deleted.
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