gistfile1.js

// Your code
    for (newColNumber = _j = 0; _j < 9; newColNumber = ++_j) {
      SecondaryField = new Layer({
        width: 1080,
        height: 240,
        backgroundColor: "#000000",
        shadowY: 2,
        shadowBlur: 5,
        borderRadius: "6px",
        y: colNumber * 242
      });
    }
    Field.shadowColor = "rgba(0, 0, 0, 0.25)";
    SecondaryField.superLayer = Field;
    SecondaryField._prefer2d = true;
    
// My code

    for (newColNumber = _j = 0; _j < 9; newColNumber = ++_j) {
      SecondaryField = new Layer({
        width: 1080,
        height: 240,
        backgroundColor: "#000000",
        shadowY: 2,
        shadowBlur: 5,
        borderRadius: "6px",
        y: colNumber * 242
      });
      SecondaryField.superLayer = Field;
      SecondaryField._prefer2d = true;
    }