How to Check if String contains only Numeric Digits in JavaScript

How to Check if String contains only Numeric Digits in JavaScript ?

Answer

To check if a string contains only numeric digits in JavaScript, you can use regular expressions or iterate through each character and check if it is a digit.

✐ Examples

1 Check if String contains only Numeric Digits using regular expression

In this example,

We create a regular expression pattern that matches numeric digits only.
We use the test method of the regular expression object with the string to check if the string matches the pattern.
If the string contains only numeric digits, matchDigits will be true, otherwise false.
Finally, we log the result to the console.

JavaScript Program

let str1 = "12345";
let matchDigits = /^[0-9]+$/.test(str1);
console.log("String contains only numeric digits: " + matchDigits);

Output

String contains only numeric digits: true

2 Check if String contains only Numeric Digits using character iteration

In this example,

We create a function containsOnlyNumericDigits that takes a string as input.
We use the every array method to iterate through each character and check if it is a digit.
If all characters are numeric digits, allDigits will be true, otherwise false.
Finally, we log the result to the console.

JavaScript Program

function containsOnlyNumericDigits(str) {
    return [...str].every(char => !isNaN(parseInt(char)));
}

let str2 = "12345";
let allDigits = containsOnlyNumericDigits(str2);
console.log("String contains only numeric digits: " + allDigits);

Output

String contains only numeric digits: true

Summary

In this tutorial, we learned How to Check if String contains only Numeric Digits in JavaScript language with well detailed examples.

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How to Check if String contains only Numeric Digits in JavaScript

How to Check if String contains only Numeric Digits in JavaScript ?

Answer

✐ Examples

1 Check if String contains only Numeric Digits using regular expression

JavaScript Program

Output

2 Check if String contains only Numeric Digits using character iteration

JavaScript Program

Output

Summary

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