check if number in string javascript code example
Example 1: 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 2: javascript is variable a string
if (typeof myVar === 'string'){
}
Example 3: check if a string contains digits js
function hasNumber(myString) {
return /\d/.test(myString);
}
Example 4: javascript check if string is number
function isNumeric(num){
return !isNaN(num)
}
isNumeric("23.33");