const fn = (p0: number, p1: number, t: number): number => {
    return (p1 - p0) * t + p0
}

export const Linear = (v: number[], k: number): number => {
    const m = v.length - 1
    const f = m * k
    const i = Math.floor(f)

    if (k < 0) {
        return fn(v[0], v[1], f)
    }

    if (k > 1) {
        return fn(v[m], v[m - 1], m - f)
    }

    return fn(v[i], v[i + 1 > m ? m : i + 1], f - i)
}