A-M baby

Task/Empty-string/Fantom/empty-string.fantom

@@ -0,0 +1,5 @@
+a := ""       // assign an empty string to 'a'
+a.isEmpty     // method on sys::Str to check if string is empty
+a.size == 0   // what isEmpty actually checks
+a == ""       // alternate check for an empty string
+!a.isEmpty    // check that a string is not empty

Task/Empty-string/Groovy/empty-string.groovy

@@ -0,0 +1,5 @@
+def s = ''  // or "" if you wish
+assert s.empty
+
+s = '1 is the loneliest number'
+assert !s.empty

Task/Empty-string/Icon/empty-string.icon

@@ -0,0 +1,16 @@
+s := ""                 # null string
+s := string('A'--'A')   # ... converted from cset difference
+s := char(0)[0:0]       # ... by slicing
+
+s1 == ""                # lexical comparison, could convert s1 to string
+s1 === ""               # comparison won't force conversion
+*s1 = 0                 # zero length, however, *x is polymorphic
+*string(s1) = 0         # zero length string
+
+s1 ~== ""               # non null strings comparisons
+s1 ~=== ""
+*string(s1) ~= 0
+
+s := &null              # NOT a null string, null type
+/s                      # test for null type
+\s                      # test for non-null type

Task/Empty-string/J/empty-string.j

@@ -0,0 +1,5 @@
+   variable=: ''
+   0=#variable
+1
+   0<#variable
+0

Task/Empty-string/K/empty-string.k

@@ -0,0 +1,5 @@
+   variable: ""
+   0=#variable
+1
+   0<#variable
+0

Task/Empty-string/LOLCODE/empty-string.lol

@@ -0,0 +1,9 @@
+HAI 1.3
+
+I HAS A string ITZ ""
+string, O RLY?
+    YA RLY, VISIBLE "STRING HAZ CONTENZ"
+    NO WAI, VISIBLE "Y U NO HAS CHARZ?!"
+OIC
+
+KTHXBYE

Task/Empty-string/Lhogho/empty-string.lhogho

@@ -0,0 +1,3 @@
+make "str " ;make null-string word
+print empty? :str ;prints 'true'
+print not empty? :str ;prints 'false'

Task/Empty-string/Liberty-BASIC/empty-string.liberty

@@ -0,0 +1,8 @@
+'assign empty string to variable
+a$ = ""
+'check for empty string
+if a$="" then print "Empty string."
+if len(a$)=0 then print "Empty string."
+'check for non-empty string
+if a$<>"" then print "Not empty."
+if len(a$)>0 then print "Not empty."

Task/Empty-string/Mathematica/empty-string.mathematica

@@ -0,0 +1,3 @@
+str=""; (*Create*)
+str==="" (*test empty*)
+str=!="" (*test not empty*)

Task/Empty-string/Maxima/empty-string.maxima

@@ -0,0 +1,9 @@
+s: ""$
+
+/* check using string contents */
+sequal(s, "");
+not sequal(s, "");
+
+/* check using string length */
+slength(s) = "";
+slength(s) # "";

Task/Empty-string/Mirah/empty-string.mirah

@@ -0,0 +1,6 @@
+empty_string1 = ""
+empty_string2 = String.new
+
+puts "empty string is empty" if empty_string1.isEmpty()
+puts "empty string has no length" if empty_string2.length() == 0
+puts "empty string is not nil" unless empty_string1 == nil