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Ingy döt Net 2026-02-01 16:33:20 -08:00
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Task/Empty-string/REXX/empty-string.rexx
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/*REXX program shows how to assign an empty string, & then check for empty/not-empty str*/
-- 8 Nov 2025
include Setting
/*─────────────── 3 simple ways to assign an empty string to a variable.*/
auk='' /*uses two single quotes (also called apostrophes); easier to peruse. */
ide="" /*uses two quotes, sometimes called a double quote. */
doe= /*··· nothing at all (which in this case, a null value is assigned. */
say 'EMPTY STRING'
say version
say
a=''; b='string'
if a='' then
say 'a is empty'
if length(a)=0 then
say 'a is empty'
if b<>'' then
say 'b is not empty'
if \(b='') then
say 'b is not empty'
if length(b)>0 then
say 'b is not empty'
exit
/*─────────────── assigning multiple null values to vars, 2 methods are:*/
parse var doe emu pug yak nit moa owl pas jay koi ern ewe fae gar hob
/*where emu, pug, yak, ··· (and the rest) are all set to a null value.*/
/*───or─── (with less clutter ─── or more, depending on your perception)*/
parse value 0 with . ant ape ant imp fly tui paa elo dab cub bat ayu
/*where the value of zero is skipped, and the rest are set to null,*/
/*which is the next value AFTER the 0 (zero): nothing (or a null).*/
/*─────────────── how to check that a string is empty, several methods: */
if cat=='' then say "the feline is not here."
if pig=="" then say 'no ham today.'
if length(gnu)==0 then say "the wildebeest's stomach is empty and hungry."
if length(ips)=0 then say "checking with == instead of = is faster"
if length(hub)<1 then method = "this is rather obtuse, don't do as I do ···"
nit='' /*assign an empty string to a lice egg.*/
if cow==nit then say 'the cow has no milk today.'
/*─────────────── how to check that a string isn't empty, several ways: */
if dog\=='' then say "the dogs are out!"
/*most REXXes support the ¬ character. */
if fox¬=='' then say "and the fox is in the henhouse."
if length(rat)>0 then say "the rat is singing" /*an obscure-ish (or ugly) way to test.*/
if elk=='' then nop; else say "long way obtuse for an elk to be tested."
if length(eel)\==0 then fish=eel /*a fast compare (than below), & quick.*/
if length(cod)\=0 then fish=cod /*a not-as-fast compare. */
/*────────────────────────── anyway, as they say: "choose your poison." */
include Abend