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
}check if a string contains digits js
function hasNumber(myString) {
return /\d/.test(myString);
}js check if string is number
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') // truejavascript check if string is number
function isNumeric(num){
return !isNaN(num)
}
isNumeric("23.33"); //true, checking if string is a number.how to check if a string contains numbers in javascript
/**
* Function to check if a string contains numbers
* @author Okoro Redemption
* @param {String} str - The string to be checked.
* @returns {Boolean} str - The result of the check.
*/
function hasNumbers(str){
var regexp = /d/g;
return regexp.test(str);
};
// use function below
hasNumbers("I am 20years old"); // => true
hasNumbers("I am a boy"); // => falseCopyright © 2021 Codeinu
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