Currency Format

function createFormatter(separator, symbol, symbolFirst, currencyFormatter) {
    return (value) => currencyFormatter(separator, symbol, symbolFirst, value)
}

function currencyFormatter(separator, symbol, symbolFirst, value) {
    let result = Math.trunc(value) + separator;
    result += value.toFixed(2).substr(-2,2);
    if (symbolFirst) return symbol + ' ' + result;
    else return result + ' ' + symbol;
}

let dollarFormatter = createFormatter(',', '$', true, currencyFormatter);
console.log(dollarFormatter(5345));
console.log(dollarFormatter(3.1429));
console.log(dollarFormatter(2.709));