Question

How to check whether a string contains only digits in JavaScript

Answer 1

function hasOnlyDigits(str) {
    return /^\d+$/.test(str);
}
 
 
console.log(hasOnlyDigits("javascript")); 
 
console.log(hasOnlyDigits("javascript ECMAScript 2020"));
 
console.log(hasOnlyDigits("23455"));
 

     
     
/*
run:
     
false
false
true
     
*/

 

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Answer 2

function hasOnlyDigits(str) {
    return str.match(/^[0-9]+$/) != null
}
 
 
console.log(hasOnlyDigits("javascript")); 
 
console.log(hasOnlyDigits("javascript ECMAScript 2020"));
 
console.log(hasOnlyDigits("23455"));
 

     
     
/*
run:
     
false
false
true
     
*/

 

70+ SQL courses for beginners and professionals