`is_[condition]`: Boolean Check

Check a condition about a datatype.

#![allow(unused)]
fn main() {
// Copyright 2025 Google LLC
// SPDX-License-Identifier: Apache-2.0

impl <T> Vec<T> {
    is_empty(&self) -> bool;
}

impl f32 {
    is_nan(self) -> bool;
}

impl u32 {
    is_power_of_two(self) -> bool;
}
}

- A boolean condition on a value.

is prefix is preferred over methods with not in the name.

There are no instances of is_not_ in standard library methods, just use !value.is_[condition].