2016 Update

Task/Empty-string/00DESCRIPTION

@@ -1,11 +1,11 @@
 Languages may have features for dealing specifically with empty strings
 (those containing no characters).
 
-The task is to:
 
-* Demonstrate how to assign an empty string to a variable.
-
-* Demonstrate how to check that a string is empty.
-* Demonstrate how to check that a string is not empty.
+;Task:
+::*   Demonstrate how to assign an empty string to a variable.
+::*   Demonstrate how to check that a string is empty.
+::*   Demonstrate how to check that a string is not empty.
+<br><br>
 
 [[Category:String manipulation]] [[Category:Simple]]

Task/Empty-string/BASIC/empty-string-2.basic

@@ -0,0 +1,3 @@
+ 10  LET A$ = "
+ 40  IF  LEN (A$) = 0 THEN  PRINT "THE STRING IS EMPTY"
+ 50  IF  LEN (A$) THEN  PRINT "THE STRING IS NOT EMPTY"

Task/Empty-string/Elena/empty-string.elena

@@ -0,0 +1,12 @@
+#import system.
+#import extensions.
+
+#symbol program = [
+    #var s := emptyLiteralValue.
+
+    (s is &empty)
+        ? [ console writeLine:"'":s:"' is empty". ].
+
+    (s is &nonempty)
+        ? [ console writeLine:"'":s:"' is not empty". ].
+].

Task/Empty-string/JavaScript/empty-string-3.js

@@ -1,3 +1,4 @@
+!!s
 s != ""
 s.length != 0
 s.length > 0

Task/Empty-string/Kotlin/empty-string.kotlin

@@ -0,0 +1,6 @@
+val s = ""
+println(s.isEmpty())    // true
+println(s.isNotEmpty()) // false
+println(s.length)       // 0
+println(s.none())       // true
+println(s.any())        // false

Task/Empty-string/PowerShell/empty-string-1.psh

@@ -0,0 +1,4 @@
+[string]$alpha = "abcdefghijklmnopqrstuvwxyz"
+[string]$empty = ""
+# or...
+[string]$empty = [String]::Empty

Task/Empty-string/PowerShell/empty-string-2.psh

@@ -0,0 +1,2 @@
+[String]::IsNullOrEmpty($alpha)
+[String]::IsNullOrEmpty($empty)

Task/Empty-string/PowerShell/empty-string.psh

@@ -1,2 +0,0 @@
-[string]::IsNullOrEmpty("")
-[string]::IsNullOrEmpty("a")

Task/Empty-string/REXX/empty-string.rexx

@@ -1,40 +1,39 @@
-/*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." */

Task/Empty-string/Rust/empty-string.rust

@@ -0,0 +1,9 @@
+let s = "";
+println!("is empty: {}", s.is_empty());
+let t = "x";
+println!("is empty: {}", t.is_empty());
+let a = String::new();
+println!("is empty: {}", a.is_empty());
+let b = "x".to_string();
+println!("is empty: {}", b.is_empty());
+println!("is not empty: {}", !b.is_empty());

Task/Empty-string/SNOBOL4/empty-string.sno

@@ -0,0 +1,7 @@
+* ASSIGN THE NULL STRING TO X
+        X =
+* CHECK THAT X IS INDEED NULL
+        EQ(X, NULL)         :S(YES)
+        OUTPUT = 'NOT NULL' :(END)
+YES     OUTPUT = 'NULL'
+END