rainbowLog.js

console.rainbow = function (str) {

let colors = [
    "red",
    "orange",
    "yellow",
    "green",
    "blue",
    "indigo",
    "violet",//white in VS Code
]
let color = "color";

let color_counter = 0;
let color_direction = 1;
let log_array = [];
let log_string = "";
for (var i = 0; i < str.length; i++){
    char = str.charAt(i)
    color = colors[color_counter];
    let char_string
    if(char != " "){
        if (color_counter >= (colors.length - 1)) {color_direction = -1}
        if (color_counter <= 0) {color_direction = 1}
        color_counter += color_direction;
        let color_string = `color:${color};font-size: large;`;
        char_string = `%c${char}`;

        log_array.push(color_string);
    } else {
        char_string = char;
    }
    log_string += char_string;
}
log_array.unshift(log_string);

this.log(...log_array);
};

//console.rainbow("Hello Fabulous World");