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:
JavaScript Code:
// Define a function named check_char with parameters str1 (a string) and char (a character)
function check_char(str1, char)
{
// Initialize a counter variable to 0
let ctr = 0;
// Use a for loop to iterate through each character in the string
for (let i = 0; i < str1.length; i++)
{
// Check if the current character is equal to the specified char and if the index is between 1 and 3 (inclusive)
if ((str1.charAt(i) == char) && (i >= 1 && i <= 3))
{
// Set the counter to 1 and break out of the loop
ctr = 1;
break;
}
}
// Check if the counter is 1 and return true, otherwise return false
if (ctr == 1) return true;
return false;
}
// Log the result of calling check_char with the arguments "Python" and "y" to the console
console.log(check_char("Python", "y"));
// Log the result of calling check_char with the arguments "JavaScript" and "a" to the console
console.log(check_char("JavaScript", "a"));
// Log the result of calling check_char with the arguments "Console" and "o" to the console
console.log(check_char("Console", "o"));
// Log the result of calling check_char with the arguments "Console" and "C" to the console
console.log(check_char("Console", "C"));
// Log the result of calling check_char with the arguments "Console" and "e" to the console
console.log(check_char("Console", "e"));
// Log the result of calling check_char with the arguments "JavaScript" and "S" to the console
console.log(check_char("JavaScript", "S"));
Sample Output:
true true true false false false
Live Demo:
See the Pen JavaScript: check a given string contains 2 to 4 numbers - basic-ex-35 by w3resource (@w3resource) on CodePen.
Flowchart:
ES6 Version:
// Define a function named check_char using arrow function syntax with parameters str1 and char
const check_char = (str1, char) => {
// Initialize a counter variable to 0
let ctr = 0;
// Use a for loop to iterate through each character in str1
for (let i = 0; i < str1.length; i++) {
// Check if the current character equals char and the index is between 1 and 3 (inclusive)
if (str1.charAt(i) === char && i >= 1 && i <= 3) {
// Set the counter to 1 and break out of the loop
ctr = 1;
break;
}
}
// Check if the counter is 1 and return true, otherwise return false
return ctr === 1;
};
// Log the result of calling check_char with the arguments "Python" and "y" to the console
console.log(check_char("Python", "y"));
// Log the result of calling check_char with the arguments "JavaScript" and "a" to the console
console.log(check_char("JavaScript", "a"));
// Log the result of calling check_char with the arguments "Console" and "o" to the console
console.log(check_char("Console", "o"));
// Log the result of calling check_char with the arguments "Console" and "C" to the console
console.log(check_char("Console", "C"));
// Log the result of calling check_char with the arguments "Console" and "e" to the console
console.log(check_char("Console", "e"));
// Log the result of calling check_char with the arguments "JavaScript" and "S" to the console
console.log(check_char("JavaScript", "S"));
Previous: JavaScript program to find the larger number from the two given positive integers, the two numbers are in the range 40..60 inclusive.
Next: JavaScript program to check if the last digit of the three given positive integers is same.
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