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JavaScript: Check a given string contains 2 to 4 numbers of a specified character

JavaScript Basic: Exercise-35 with Solution

Write a JavaScript program to check a given string contains 2 to 4 numbers of a specified character.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to check a given string contains 2 to 4 numbers of a specified character.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function check_char(str1, char)
 {
  ctr = 0;
  for (let i = 0; i < str1.length; i++)
  {
    if ((str1.charAt(i) == char) && (i >= 1 && i <= 3))
    {
        ctr=1;
        break;
    }
   }
   if (ctr==1) return true;
   return false;
}
console.log(check_char("Python", "y"));
console.log(check_char("JavaScript", "a"));
console.log(check_char("Console", "o"));
console.log(check_char("Console", "C"));
console.log(check_char("Console", "e"));
console.log(check_char("JavaScript", "S"));

Sample Output:

true
true
true
false
false
false

Flowchart:


ES6 Version:

(function() {
    "use strict";
    function check_char(str1, char)
     {
      ctr = 0;
      for (let i = 0; i < str1.length; i++)
      {
        if ((str1.charAt(i) == char) && (i >= 1 && i <= 3))
        {
            ctr=1;
            break;
        }
       }
       if (ctr==1) return true;
       return false;
    }
    console.log(check_char("Python", "y"));
    console.log(check_char("JavaScript", "a"));
    console.log(check_char("Console", "o"));
    console.log(check_char("Console", "C"));
    console.log(check_char("Console", "e"));
    console.log(check_char("JavaScript", "S"));
}).call(this);

Live Demo:

See the Pen JavaScript: check a given string contains 2 to 4 numbers - basic-ex-35 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to find the larger number from the two given positive integers, the two numbers are in the range 40..60 inclusive.
Next: Write a JavaScript program to check if the last digit of the three given positive integers is same.

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JavaScript: Tips of the Day

Returns the sum of the powers of all the numbers from start to end (both inclusive)

Example:

const sumPower = (end, power = 2, start = 1) =>
  Array(end + 1 - start)
    .fill(0)
    .map((x, i) => (i + start) ** power)
    .reduce((a, b) => a + b, 0);
console.log(sumPower(10)); // 385
console.log(sumPower(10, 3)); // 3025
console.log(sumPower(10, 3, 5)); // 2925

Output:

385
3025
2925