Recursive object manipulation

RECURS_OBJECTS.js

const iterateObject = (obj, executeOnValue) => {
    Object.keys(obj).forEach(name=> {
        let val = obj[name];
        if (typeof val === "object") {
            return iterateObject(val, executeOnValue);
        } else if (val === undefined) {
            obj[name] = "";
        } else {
            obj[name] = executeOnValue(val);
        }
    });
};
let deepObject = {
    palette: {
        common: {
            black: "rgba(96, 39, 39, 1)",
            white: "#fff"
        },
        background: {
            paper: "rgba(214, 234, 251, 1)",
            default: "rgba(241, 246, 247, 1)"
        },
        primary: {
            light: "#7986cb",
            main: "rgba(242, 25, 163, 1)",
            dark: "rgba(35, 54, 178, 1)",
            contrastText: "#fff"
        },
        secondary: {
            light: "#ff4081",
            main: "rgba(139, 17, 246, 1)",
            dark: "#c51162",
            contrastText: "#fff"
        }
    }
};

iterateObject(deepObject, value => {
    if (value.includes("rgba")) {
        return "---"+value;
    } else {
        return value;
    }
});

console.warn("Updated object", deepObject);

// Yields

/*
{
  palette: {
    common: { black: "---rgba(96, 39, 39, 1)", white: "#fff" },
    background: {
      paper: "---rgba(214, 234, 251, 1)",
      default: "---rgba(241, 246, 247, 1)"
    },
    primary: {
      light: "#7986cb",
      main: "---rgba(242, 25, 163, 1)",
      dark: "---rgba(35, 54, 178, 1)",
      contrastText: "#fff"
    },
    secondary: {
      light: "#ff4081",
      main: "---rgba(139, 17, 246, 1)",
      dark: "#c51162",
      contrastText: "#fff"
    }
  }
}
*/