Question

How to check if a character in a string is numeric with Node.js

Answer 1

const str = 'node.js 1234';
 
const character = str[9];
 
if (!isNaN(character * 1)) {
    console.log('character is numeric');
}
 
   
   
/*
run:
         
character is numeric
       
*/

 

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Answer 2

const str = 'node.js 1234';
 
const character = str[9];
 
if (character >= '0' && character <= '9') {
    console.log('character is numeric');
}
 
   
   
/*
run:
         
character is numeric
       
*/

 

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Answer 3

function isnumeric(ch) {
    return ch.match(/[0-9]/i);
}
 
const str = 'node.js 1234';
 
const character = str[9];
 
if (isnumeric(character)) {
    console.log('character is numeric');
}
 
   
   
/*
run:
         
character is numeric
       
*/

 

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