JSFiddle - React, Tailwind, and code Playground

JavaScript

function FormatGrid(ID, Format) {
    if (typeof Format != 'string') {
        
        for (var item in Format) {
            if (!Format.hasOwnProperty(item)) {
                continue;
            }
            this[item] = Format[item];
       }
    }

    console.log(HeaderFont, HeaderLinkFont);

    // Here you could then access `options.HeaderFont`.
}

FormatGrid(5, {
    HeaderFont: 'blue',
    HeaderLinkFont: 'red'
})
    
console.log(typeof HeaderFont);