typescript check if string is number
let numberToCheck: string = "40";
if(!isNaN(Number(numberToCheck))) {
console.log("string is a number")
}
else {
console.log("string is NOT a number")
}typescript check if string is number
let numberToCheck: string = "40";
if(!isNaN(Number(numberToCheck))) {
console.log("string is a number")
}
else {
console.log("string is NOT a number")
}javascript check if number
//Updated dec 2020
// The first 2 Variations return a Boolean
// They just work the opposite way around
// IsInteger
if (Number.isInteger(val)) {
// It is indeed a number
}
// isNaN (is not a number)
if (isNaN(val)) {
// It is not a number
}
// Another option is typeof which return a string
if (typeof(val) === 'number') {
// Guess what, it's a bloody number!
}Copyright © 2021 Codeinu
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