Ternary logic: Difference between revisions
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=={{header|Vlang}}==
{{trans|AutoHotkey}}
Note:
1) Vlang doesn't have a true "ternary" operator, but unlike in other languages, its "if-else if-else" can be written on a single line.
2) This "trick" can make code more understandable, where a traditional ternary style could be visually confusing.
3) Something like this, "a=1?b:a=0?1:a+b>1?1:0.5" is instead "if a == 1 {b} else if a == 0 {1} else if a + b > 1 {1} else {0.5}"
Below is an example of how this would look, which can be compared to traditional ternary usage:
<lang vlang>import math
fn main() {
aa := [1.0,0.5,0]
bb := [1.0,0.5,0]
mut res :=''
for a in aa {
res += '\tTernary_Not\t' + a.str() + '\t=\t' + ternary_not(a) + '\n'
}
res += '-------------\n'
for a in aa {
for b in bb {
res += a.str() + '\tTernary_And\t' + b.str() + '\t=\t' + ternary_and(a,b) + '\n'
}
}
res += '-------------\n'
for a in aa {
for b in bb {
res += a.str() + '\tTernary_or\t' + b.str() + '\t=\t' + ternary_or(a,b) + '\n'
}
}
res += '-------------\n'
for a in aa {
for b in bb {
res += a.str() + '\tTernary_then\t' + b.str() + '\t=\t' + ternary_if_then(a,b) + '\n'
}
}
res += '-------------\n'
for a in aa {
for b in bb {
res += a.str() + '\tTernary_equiv\t' + b.str() + '\t=\t' + ternary_equiv(a,b) + '\n'
}
}
res = res.replace('1.', 'true')
res = res.replace('0.5', 'maybe')
res = res.replace('0', 'false')
println(res)
}
fn ternary_not(a f64) string {
return math.abs(a-1).str()
}
fn ternary_and(a f64, b f64) string {
return if a < b {a.str()} else {b.str()}
}
fn ternary_or(a f64, b f64) string {
return if a > b {a.str()} else {b.str()}
}
fn ternary_if_then(a f64, b f64) string {
return if a == 1 {b.str()} else if a == 0 {'1.'} else if a + b > 1 {'1.'} else {'0.5'}
}
fn ternary_equiv(a f64, b f64) string {
return if a == b {'1.'} else if a == 1 {b.str()} else if b == 1 {a.str()} else {'0.5'}
}</lang>
{{out}}
<pre>
Ternary_Not true = false
Ternary_Not maybe = maybe
Ternary_Not false = true
-------------
true Ternary_And true = true
true Ternary_And maybe = maybe
true Ternary_And false = false
maybe Ternary_And true = maybe
maybe Ternary_And maybe = maybe
maybe Ternary_And false = false
false Ternary_And true = false
false Ternary_And maybe = false
false Ternary_And false = false
-------------
true Ternary_or true = true
true Ternary_or maybe = true
true Ternary_or false = true
maybe Ternary_or true = true
maybe Ternary_or maybe = maybe
maybe Ternary_or false = maybe
false Ternary_or true = true
false Ternary_or maybe = maybe
false Ternary_or false = false
-------------
true Ternary_then true = true
true Ternary_then maybe = maybe
true Ternary_then false = false
maybe Ternary_then true = true
maybe Ternary_then maybe = maybe
maybe Ternary_then false = maybe
false Ternary_then true = true
false Ternary_then maybe = true
false Ternary_then false = true
-------------
true Ternary_equiv true = true
true Ternary_equiv maybe = maybe
true Ternary_equiv false = false
maybe Ternary_equiv true = maybe
maybe Ternary_equiv maybe = true
maybe Ternary_equiv false = maybe
false Ternary_equiv true = false
false Ternary_equiv maybe = maybe
false Ternary_equiv false = true
</pre>
=={{header|Wren}}==
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