lag

array →
lag() → array

Returns the previous value for each input element. The first output value is null because there is no previous element. Preserves input cardinality (one output item per input item). Returns null when the input is not an enumerable or is a string.

Parameters

This function has no parameters.

Examples

{1, 2, 3} | lag → {#null, 1, 2}

Kind: Function
Scope: array
Aliases: array-to-lag