制御フロー

If / Elif / Else

if x lt 0
  console.log[///negative///]
elif x eq 0
  console.log[///zero///]
else
  console.log[///positive///]

Unless

if の否定:

unless done
  keep-going[]

if (!(done)) {
  keepGoing();
}

インラインif（三項演算子）

const result be if condition then 1 else 2

const result = condition ? 1 : 2;

後置修飾子

console.log[///debug///] if verbose
console.log[///skip///] unless done
console.log[item] for item in list

While / Until

while i lt 10
  i be i add 1

until finished
  do-work[]

For-in

for item in items
  console.log[item]

for (const item of items) {
  console.log(item);
}

インデックス付き:

for i; item in items
  console.log[i; item]

for (let [i, item] of items.entries()) {
  console.log(i, item);
}

For-range

for i in range 0; 10
  console.log[i]

for (let i = 0; i < 10; i++) {
  console.log(i);
}

Match / When

match x
  when 1 then ///one///
  when 2 then ///two///
  else ///other///

ガード付き:

match value
  when n if n gt 0
    console.log[///positive///]
  else
    console.log[///non-positive///]

try / catch / finally

try
  risky[]
catch e
  console.log[e]
finally
  cleanup[]

式としてのtry

const result be try
  risky[]
catch e
  default-value

Throw

throw new Error[///something went wrong///]
throw err if condition