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 string is number
if (typeof myVar === 'string'){
//I am indeed a string
}js check if string is number
isNaN(num) // returns true if the variable does NOT contain a valid number
isNaN(123) // false
isNaN('123') // false
isNaN('1e10000') // false (This translates to Infinity, which is a number)
isNaN('foo') // true
isNaN('10px') // truejavascript check if string is number
function isNumeric(num){
return !isNaN(num)
}
isNumeric("23.33"); //true, checking if string is a number.js check if string is integer
function isInt(str) {
return !isNaN(str) && Number.isInteger(parseFloat(str));
}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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