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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 program to check whether a specified character exists between the 2nd and 4th positions in a given string.

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:

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

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

Parse an HTTP Cookie header string and return an object of all cookie name-value pairs

Example:

const parseCookie = str =>
  str
    .split(';')
    .map(v => v.split('='))
    .reduce((acc, v) => {
      acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());
      return acc;
    }, {});
console.log(parseCookie('foo=bar; equation=E%3Dmc%5E2')); // { foo: 'bar', equation: 'E=mc^2' }

Output:

[object Object] {
  equation: "E=mc^2",
  foo: "bar"
}

 

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