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JavaScript: Replace the first digit in a string (should contains at least digit) with $ character

JavaScript Basic: Exercise-136 with Solution

Write a JavaScript program to replace the first digit in a string (should contains at least digit) with $ character.

Pictorial Presentation:

JavaScript: Replace the first digit in a string (should contains at least digit) with $ character.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Replace the first digit in a string (should contains at least digit) with $ character</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function replace_first_digit(input_str) {

  return input_str.replace(/[0-9]/, '$');
}
console.log(replace_first_digit("abc1dabc"));
console.log(replace_first_digit("p3ython"));
console.log(replace_first_digit("ab1cabc"));

Sample Output:

abc$dabc
p$ython
ab$cabc

Flowchart:

Flowchart: JavaScript - Replace the first digit in a string (should contains at least digit) with $ character

ES6 Version:

function replace_first_digit(input_str) {

  return input_str.replace(/[0-9]/, '$');
}
console.log(replace_first_digit("abc1dabc"));
console.log(replace_first_digit("p3ython"));
console.log(replace_first_digit("ab1cabc"));

Live Demo:

See the Pen javascript-basic-exercise-136 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous:Write a JavaScript program to remove all characters from a given string that appear more than once.
Next: Write a JavaScript program to test if a given integer is greater than 15 return the given number, otherwise return 15.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04