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2016 Update

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Tina Müller 2016-12-05 22:15:40 +01:00
parent 948b86eafa
commit dcf5d15da3
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Task/Empty-string/REXX/empty-string.rexx
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/*REXX: how to assign an empty string & then check for empty/not-empty.*/
/*REXX program shows how to assign an empty string, & then check for empty/not-empty str*/
/*─────────────── 3 simple wats to assign an empty string to a variable.*/
auk='' /*uses two single quotes or apostrophies. */
ide="" /*uses two quotes, sometimes called a double quote.*/
doe= /*... nothing at all. */
/*─────────────── 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. */
/*─────────────── assigning multiple null values to vars, 2 methods are:*/
ram=0
parse var ram . emu pug yak nit moa owl pas jay koi ern ewe fae gar hob
/*where the value of zero is skipped, the rest set to null,*/
/*which is the next value AFTER the value of RAM (nothing).*/
/*─────────────── 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
/*───or─── (with less clutter ─── or more, ... perception).*/
/*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, the rest set to null,*/
/*which is the next value AFTER the 0 (zero): nothing. */
/*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 wildebeast is empty & hungry."
if length(ips)=0 then say "checking with == instead of = is faster"
if length(hub)<1 then method = "obtuse, don't do as I do ..."
/*─────────────── 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.'
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: */
/*─────────────── how to check that a string isn't empty, several ways: */
if dog\=='' then say "the dogs are out!"
/*most REXXes support the "not" character. */
/*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" /*ugly way to test.*/
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 for an elk to be tested."
if elk=='' then nop; else say "long way obtuse for an elk to be tested."
if length(eel)\==0 then fish=eel /*fast compare, quick.*/
if length(cod)\=0 then fish=cod /*not-so-fast compare.*/
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." */
/*────────────────────────── anyway, as they say: "choose your poison." */