Answers for "check if string has numbers javascript"

1

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')      // false
Posted by: Guest on September-02-2020
13

javascript check if string is number

if (typeof myVar === 'string'){
    //I am indeed a string
}
Posted by: Guest on July-23-2019
1

check if a string contains digits js

function hasNumber(myString) {
  return /\d/.test(myString);
}
Posted by: Guest on July-22-2020
7

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')      // true
Posted by: Guest on April-08-2020
1

javascript check if string is number

function isNumeric(num){
  return !isNaN(num)
}
isNumeric("23.33"); //true, checking if string is a number.
Posted by: Guest on July-25-2019
-1

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"); // => false
Posted by: Guest on January-09-2021

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