Fuzion • Idioms • Idiom # 52: Check if map contains value

Idiom # 52: Check if map contains value

Code

for x in m.values until v = x

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for x in m.values until v = x
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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What are effects?

Running Example

We can use the check code from above as the condition in an 'if' statement, but it needs to be enclosed in parentheses (otherwise the code in the following line would become part of the until-clause):

m := container.ordered_map [ "Hund", "Katze", "Maus" ] [ "dog", "cat", "mouse" ]

c := "cat"
if (for x in m.values until c = x)
  say "$c was found"
else
  say "$c not found"

b := "budgie"
if (for x in m.values until b = x)
  say "$b was found"
else
  say "$b not found"

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m := container.ordered_map [ "Hund", "Katze", "Maus" ] [ "dog", "cat", "mouse" ]
c := "cat"
if (for x in m.values until c = x)
  say "$c was found"
else
  say "$c not found"
b := "budgie"
if (for x in m.values until b = x)
  say "$b was found"
else
  say "$b not found"
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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What are effects?

Alternatively, we could just add code after the until-clause and add an else-clause to the loop:

map := (container.ordered_map [ "Hund", "Katze", "Maus" ]
                              [ "dog",  "cat",  "mouse" ])

m := "mouse"
for x in map.values until m = x
  say "$m was found"
else
  say "$m not found"

a := "axolotl"
for x in map.values until a = x
  say "$a was found"
else
  say "$a not found"

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map := (container.ordered_map [ "Hund", "Katze", "Maus" ]
                              [ "dog",  "cat",  "mouse" ])
m := "mouse"
for x in map.values until m = x
  say "$m was found"
else
  say "$m not found"
a := "axolotl"
for x in map.values until a = x
  say "$a was found"
else
  say "$a not found"
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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What are effects?

last changed: 2025-05-13

next: Idiom # 53: Join a list of strings