create a mesh with 2 triangles in Unity

makeTriangles.js

#pragma strict

// Script to create a mesh with 2 triangles.
// This should be attached to an empty GameObject.
// It assumes the existence of a custom shader to use the vertex colors
// without texture or lighting.

function Start ()
    {
    gameObject.AddComponent.<MeshFilter>();
    gameObject.AddComponent.<MeshRenderer>();
    var mat = new Material(Shader.Find("Custom/Vertex Colored"));
    GetComponent.<Renderer>().material = mat;
    var p0 : Vector3 = Vector3(-2,0,-1);
    var p1 : Vector3 = Vector3(0,1,-1);
    var p2 : Vector3 = Vector3(1,0,-1);
    var p3 : Vector3 = Vector3(0,-1,-1);
    var newVertices = [ p0, p1, p2, p3 ];
    var newColors = [ Color(1, 0, 0), Color(0,1,0), Color(0,0,1), Color(1,1,0) ];
    var newTriangles = [ 0, 1, 2, 0, 2, 3 ];
    var m = GetComponent.<MeshFilter>().mesh;
    m.vertices = newVertices;
    m.colors = newColors;
    m.triangles = newTriangles;
    }


function Update()
    {
    }