Data update

Task/Conditional-structures/EMal/conditional-structures.emal

@@ -1,4 +1,4 @@
-int i = 19
+int i ← 19
 ^|if–then–else|^
 if i > 18
   writeLine("greater than 18")
@@ -6,14 +6,14 @@ else
   writeLine("less or equal to 18")
 end
 ^|else if|^
-if i == 18 do writeLine("equal to 18")
+if i æ 18 do writeLine("equal to 18")
 else if i < 18 do writeLine("less than 18")
 else do writeLine("greater than 18")
 end
 ^|when expression: just like iif in Visual Basic|^
 writeLine(when(i > 18, "greater than 18", "less or equal to 18"))
 ^|hash-based conditionals|^
-Map dispatch = int%fun[
-  18 => <|writeLine("equal to 18"),
-  19 => <|writeLine("yeah, it's 19")]
+Map dispatch ← int%fun[
+  18 ⇒ <|writeLine("equal to 18"),
+  19 ⇒ <|writeLine("yeah, it's 19")]
 if dispatch.has(i) do dispatch[i]() end

Task/Conditional-structures/EasyLang/conditional-structures.easy

@@ -1,4 +1,4 @@
-i = randint 10
+i = random 10
 if i mod 2 = 0
    print i & " is divisible by 2"
 elif i mod 3 = 0

Task/Conditional-structures/Ed/conditional-structures.ed

@@ -0,0 +1,2 @@
+g/True/s//It's true!/p
+v/True/s/.*/It's false!/p

Task/Conditional-structures/MariaDB/conditional-structures-1.sql

@@ -0,0 +1,9 @@
+SELECT
+    IF(can_fly, 'Superman', 'Batman'),
+    -- replace NULL with string
+    IFNULL(can_fly, 'Not clear if this user can fly'),
+    -- alias for IFNULL
+    NVL(can_fly, 'Not clear if this user can fly'),
+    -- replace '' with NULL
+    NULLIF(can_fly, '')
+    FROM user;

Task/Conditional-structures/MariaDB/conditional-structures-2.sql

@@ -0,0 +1,12 @@
+SELECT
+    -- return the first non-NULL value
+    COALESCE(email, phone, telegram_id) AS contact,
+    -- replace the key (1) with corresponding value ('email')
+    CASE contact_type WHEN 1 THEN 'email' WHEN 2 THEN 'phone' ELSE NULL END AS contact_type,
+    -- the first parameter must be a 1-based integer,
+    -- ELT() returns the nth argument (eg, for n=1 it will return the email column)
+    ELT(n, email, phone, telegram_id) AS preferred_contact,
+    -- returns the index of the value that is equal to the 1st argument:
+    -- in this example, 2
+    FIELD('phone',  'email', 'phone', 'telegram_id') AS type;
+    FROM user;

Task/Conditional-structures/MariaDB/conditional-structures-3.sql

@@ -0,0 +1,14 @@
+BEGIN NOT ATOMIC
+    IF @b IS TRUE THEN
+        SELECT '@b is true';
+    ELSEIF b IS FALSE THEN
+        SELECT '@b is false';
+    ELSE
+        SELECT '@b is null';
+    END;
+    CASE @b
+        WHEN TRUE THEN SELECT '@b is true';
+        WHEN FALSE THEN SELECT '@b is false';
+        ELSE SELECT '@b is null';
+    END CASE;
+END;

Task/Conditional-structures/Tailspin/conditional-structures-2.tailspin

@@ -0,0 +1,10 @@
+foo templates
+  when <|=0> do 'zero' !
+  when <|..0> do
+    'negative ' !
+    -$ -> # !
+  when <|?($ mod 2 matches <|=0>)> do 'even' !
+  otherwise 'odd' !
+end foo
+
+2 -> if <|3..5> -> $ + 10 !