javascript check if string is number
// native returns true if the variable does NOT contain a valid number
isNaN(num)
// can be wrapped for making simple and readable
function isNumeric(num){
return !isNaN(num)
}
isNumeric(123) // true
isNumeric('123') // true
isNumeric('1e10000') // true (This translates to Infinity, which is a number)
isNumeric('foo') // false
isNumeric('10px') // falsejavascript check if number
// 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!
}javascript check if string is number
if (typeof myVar === 'string'){
//I am indeed a string
}javascript check if string is number
function isNumeric(num){
return !isNaN(num)
}
isNumeric("23.33"); //true, checking if string is a number.javascript check if variable is number
function isNumber(n) {
return !isNaN(parseFloat(n)) && !isNaN(n - 0);
}js check if string or int
var myString = "abc123";
var otherString = "123";
/* isInterger() checks if an value repersents an int */
Number.isInteger(myString); //returns false
Number.isInteger(otherString); //returns trueCopyright © 2021 Codeinu
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