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 int
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))
}how to check if a string is an integer javascript
isNaN(num) // returns true if the variable does NOT contain a valid numberCopyright © 2021 Codeinu
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