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Open the code editor, create a file named as ‘containsNum.ts’, and write the below code: const str = "23444" If it is NaN, it signifies that the string does not include just numeric characters, thus we use the ! operator to negate the result. So here we will take a string, we will use parseInt() to convert the string to an integer, then by using isNaN(), we will check whether it is a number or not. If the string solely contains numeric characters, parseInt() will return a legitimate integer otherwise, it will return NaN. The parseInt() method is used to convert text to an integer. If the value is NaN, it returns true otherwise, it returns false. The isNaN() function accepts one input of any value. The isNaN() function in TypeScript is a built-in function that determines whether or not a value is NaN (Not a Number).

Here we will see how to check if string contains only numbers by using the isNaN() function in typescript in typescript. Using the match() function in typescript.Using a regular expression in typescript.Using the isNaN() function in typescript.