f::fold (public)

 f::fold f e xs

Defined in packages/acs-tcl/tcl/ad-functional-procs.tcl

Takes a binary function f, a start element e and a list {x1 x2 ...} and returns f (...(f (f (f e x1) x2) x3)...). Examples: f::fold + 0 [list 1 2 3 4] = 10 f::fold * 1 [list 1 2 3 4] = 24

Parameters:

f (required)

e (required)

xs (required)

Partial Call Graph (max 5 caller/called nodes):

Testcases:

functional_api

Source code:

    set result $e
    foreach x $xs {
        set result [$f $result $x]
    }
    return $result

XQL Not present:

Generic, PostgreSQL, Oracle