Question : javascript check if string is number
Answered by : vikash-kumar
// 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') // false
Source : | Last Update : Wed, 09 Sep 20
Question : javascript check if string is number
Answered by : code-grepper
if (typeof myVar === 'string'){ //I am indeed a string
}
Source : | Last Update : Tue, 30 Jul 19
Question : js check if string is integer
Answered by : alfons-nilsson
function isInt(str) { return !isNaN(str) && Number.isInteger(parseFloat(str));
}
Source : | Last Update : Thu, 11 Jun 20
Question : javascript check if string is number
Answered by : code-grepper
function isNumeric(num){ return !isNaN(num)
}
isNumeric("23.33"); //true, checking if string is a number.
Source : | Last Update : Thu, 01 Aug 19
Question : js check if string is number
Answered by : kees-van-beilen
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') // true
Source : | Last Update : Wed, 15 Apr 20
Question : js check if string is int
Answered by : antti-veikkolainen
function isNumeric(str) { // Check if input is string if (typeof str != "string") return false // Use type coercion to parse the _entirety_ of the string // (`parseFloat` alone does not do this). // Also ensure that the strings whitespaces fail return !isNaN(str) && !isNaN(parseFloat(str))
}
Source : | Last Update : Thu, 18 Feb 21
Question : how to check if a string is an integer javascript
Answered by : timothy-hardy
isNaN(num) // returns true if the variable does NOT contain a valid number
Source : https://stackoverflow.com/questions/175739/built-in-way-in-javascript-to-check-if-a-string-is-a-valid-number | Last Update : Thu, 05 Nov 20
Question : js check if a string is a number
Answered by : ang
function isNumeric(str) { if (typeof str != "string") return false // we only process strings! return !isNaN(str) && // use type coercion to parse the _entirety_ of the string (`parseFloat` alone does not do this)... !isNaN(parseFloat(str)) // ...and ensure strings of whitespace fail
}
Source : https://stackoverflow.com/questions/175739/how-can-i-check-if-a-string-is-a-valid-number | Last Update : Thu, 27 Jan 22