how to check if a string is an integer javascript
// 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
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4.5
2
if (typeof myVar === 'string'){<br/> //I am indeed a string<br/>}
Thank you!
2
4.5
(2 Votes)
0
4.43
7
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))
}
Thank you!
7
4.43
(7 Votes)
0
3.78
9
isNaN(num) // returns true if the variable does NOT contain a valid number
Thank you!
9
3.78
(9 Votes)
0
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