how to check if a string is a number js code example
Example 1: javascript check if number
if (Number.isInteger(val)) {
}
if (isNaN(val)) {
}
if (typeof(val) === 'number') {
}
Example 2: javascript check if string is number
isNaN(num)
function isNumeric(num){
return !isNaN(num)
}
isNumeric(123)
isNumeric('123')
isNumeric('1e10000')
isNumeric('foo')
isNumeric('10px')
Example 3: javascript is variable a string
if (typeof myVar === 'string'){
}
Example 4: js check if string is number
isNaN(num)
isNaN(123)
isNaN('123')
isNaN('1e10000')
isNaN('foo')
isNaN('10px')
Example 5: javascript check if string is number
function isNumeric(num){
return !isNaN(num)
}
isNumeric("23.33");
Example 6: js check if string is integer
function isInt(str) {
return !isNaN(str) && Number.isInteger(parseFloat(str));
}