JSFiddle - React, Tailwind, and code Playground

by WK_of_Angmar

JavaScript

function IsNumeric(num) {
    if (num >= 0 || num < 0) {
        return "<strong>T</strong> ";
    } else {
        return "F ";
    };
};

document.write(IsNumeric("Infinity"));
document.write(IsNumeric("-Infinity"));
document.write(IsNumeric(Infinity));
document.write(IsNumeric(-Infinity));
document.write(IsNumeric("003"));
document.write(IsNumeric(003));
document.write(IsNumeric("-003"));
document.write(IsNumeric(-003));
document.write(IsNumeric(0xFF));
document.write(IsNumeric("0xFF"));
document.write(IsNumeric(-0xFF));
document.write(IsNumeric("-0xFF"));
document.write(IsNumeric("-2"));
document.write(IsNumeric("2"));
document.write(IsNumeric(2));
document.write(IsNumeric(-2));
document.write(IsNumeric("10e2"));
document.write(IsNumeric("-10e2"));
document.write(IsNumeric("10e-2"));
document.write(IsNumeric("-10e-2"));
document.write(IsNumeric(""));
document.write(IsNumeric(" "));
document.write(IsNumeric("   "));
document.write(IsNumeric(true));
document.write(IsNumeric(false));
document.write(IsNumeric(null));

document.write("<br>");

document.write(IsNumeric("abcdefghijklmnopqrstuvwxyz0123456789"));
document.write(IsNumeric("0123456789abcdefghijklmnopqrstuvwxyz"));
document.write(IsNumeric("."));
document.write(IsNumeric(/x/));
document.write(IsNumeric("true"));
document.write(IsNumeric("false"));
document.write(IsNumeric(undefined));
document.write(IsNumeric("undefined"));
document.write(IsNumeric("null"));
document.write(IsNumeric("Math.PI"));
document.write(IsNumeric("NaN"));
document.write(IsNumeric(NaN));
document.write(IsNumeric(new Date()));
document.write(IsNumeric(new Object()));
document.write(IsNumeric(function(){}));