JAVASCRIPT

js is number

Number.isInteger(value)

js is numeric

function isNumeric(num) {
    if (num === '' || num === null) {
        return false
    }
    return !isNaN(num)
}

isNumeric('') //false
isNumeric('7') //true
isNumeric(7) //true
isNumeric('7a') //false
isNumeric('a') //false
isNumeric(null) //false
isNumeric(0) //true
isNumeric('0') //true
isNumeric(true) //true
isNumeric(false) //true

javascript js isNumber

// strict, matches only objects of type 'number'
// excluding Infinity and NaN.
function isNumber(n) {
    return typeof n === 'number' && isFinite(n);
}

javascript is int

let testString="5";

if(Number.isInteger(parseFloat(testString))){
 console.log("we are a int of some sort");                             
}    

javascript check if number

function isNumber(value) {
  return !isNaN(value) && parseFloat(Number(value)) === value && !isNaN(parseInt(value, 10));
}