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ARRAY_FIRST

array_first

array_first

description

Returns the first element in the array for which func(arr1[i]) returns something other than 0.

Syntax

T array_first(lambda, ARRAY<T>)

Use a lambda bool expression and an array as the input parameters, the lambda expression is used to evaluate the internal data of other input ARRAY parameters.

example

mysql> select array_first(x->x>2, [1,2,3,0]) ;
+------------------------------------------------------------------------------------------------+
| array_first(array_filter(ARRAY(1, 2, 3, 0), array_map([x] -> x(0) > 2, ARRAY(1, 2, 3, 0))), -1) |
+------------------------------------------------------------------------------------------------+
| 3 |
+------------------------------------------------------------------------------------------------+


mysql> select array_first(x->x>4, [1,2,3,0]) ;
+------------------------------------------------------------------------------------------------+
| array_first(array_filter(ARRAY(1, 2, 3, 0), array_map([x] -> x(0) > 4, ARRAY(1, 2, 3, 0))), -1) |
+------------------------------------------------------------------------------------------------+
| NULL |
+------------------------------------------------------------------------------------------------+


mysql> select array_first(x->x>1, [1,2,3,0]) ;
+---------------------------------------------------------------------------------------------+
| array_first(array_filter(ARRAY(1, 2, 3, 0), array_map([x] -> x > 1, ARRAY(1, 2, 3, 0))), 1) |
+---------------------------------------------------------------------------------------------+
| 2 |
+---------------------------------------------------------------------------------------------+

keywords

ARRAY, LAST, array_first