JavaScript How to check nth char of a string is a number with js? check char string java,check char string javascript,check char

You could use isNaN and take the negated value.

console.log(!isNaN('123'[1])); // true, is number
console.log(!isNaN('1a3'[1])); // false, is not a number
Answer:1

You can use \d regex to test against array index.

var a = 'abc1def';

console.log(/\d/.test(a[3]))
console.log(/\d/.test(a[1]))
Answer:2

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