(defun func1 (x) (+ 1 (* 2 x)))

##</code><code>##

(func1 3)      ; Function call
(+ 1 (* 2 3))  ; All occurrences of 'x' replaced with '3'
(+ 1 6)        ; Reduce
7              ; Reduce

##</code><code>##

(defun func2 (x) (+ 1 (* 2 x) (* 3 x)))

##</code><code>##

(func2 3)              ; Function call
(+ 1 (* 2 3) (* 3 3))  ; All ocurrences of 'x' replaced with '3'

##</code><code>##

my @str_lengths = map { length } @strs;

##</code><code>##

my @str_lengths = do {
    use threadsafe;
    map { length } @strs;
};