A modern programming language that makes developers happier.

kotlinlang

Here's an example:
```
class Basis(
    var xx: Double = 1.0, var xy: Double = 0.0, var xz: Double = 0.0,
    var yx: Double = 0.0, var yy: Double = 1.0, var yz: Double = 0.0,
    var zx: Double = 0.0, var zy: Double = 0.0, var zz: Double = 1.0
) {
    constructor(x: Vector3 = Vector3.x(), y: Vector3 = Vector3.y(), z: Vector3 = Vector3.z()) : this(
        x.x, x.y, x.z,
        y.x, y.y, y.z,
        z.x, z.y, z.z
    )

    companion object {
        fun ident() = Basis()
        fun scale(x: Double = 1.0, y: Double = 1.0, z: Double = 1.0) = Basis(xx = x, yy = y, zz = z)
    }
}
```
The `ident` function in the companion object is calling the secondary constructor, and so is creating extra `Vector3` objects when there is no need to. Wouldn't it make more sense to use the primary constructor whenever possible (that is the point of primary, is it not)?