Returns true if the option is a Some value.

const x: Option<number> = Some(2);
assert.equal(x.isSome(), true);

const y: Option<number> = None;
assert.equal(y.isSome(), false);

In Rust

Returns true if the option is a None value.

const x: Option<number> = Some(2);
assert.equal(x.isNone(), false);

const y: Option<number> = None;
assert.equal(y.isNone(), true);

In Rust