2 "34" (2, 3, true) [64, 42, 5] { foo: "bar" } foo bar fn(1234) if 文と条件演算子if.jslet foo;
if (condition) {
foo = 3;
} else {
foo = 1;
}
const foo = condition ? 3 : 1; if 式if-ex.rslet foo = if condition {
3
} else {
1
}