JavaScript: Check whether a given string contains only Latin letters and no two uppercase and no two lowercase letters are in adjacent positions
JavaScript Basic: Exercise-101 with Solution
Write a JavaScript program to check whether a given string contains only Latin letters and no two uppercase and no two lowercase letters are in adjacent positions.
Visual Presentation:
Sample Solution:
JavaScript Code:
// Function to test a string
function test_string(input_str) {
// Function to check if symbol is lowercase
var is_lower_case = function(symbol) {
if ('a' <= symbol && symbol <= 'z') {
return true;
}
return false;
}
// Function to check if symbol is uppercase
var is_upper_case = function(symbol) {
if ('A' <= symbol && symbol <= 'Z') {
return true;
}
return false;
}
// Check if the first character is lowercase or uppercase
var is_first_char_lower = is_lower_case(input_str[0]),
is_first_char_upper = is_upper_case(input_str[0]);
// If the first character is neither lowercase nor uppercase, return false
if (!(is_first_char_lower || is_first_char_upper)) {
return false;
}
// Iterate through the string
for (var i = 1; i < input_str.length; i++) {
// Check odd positions
if (i % 2) {
// Check if the character's case differs from the first character's case
if (is_lower_case(input_str[i]) === is_first_char_lower ||
is_upper_case(input_str[i]) === is_first_char_upper) {
return false; // Return false if cases are the same
}
} else {
// Check if the character's case matches the first character's case
if (is_lower_case(input_str[i]) !== is_first_char_lower ||
is_upper_case(input_str[i]) !== is_first_char_upper) {
return false; // Return false if cases do not match
}
}
}
return true; // Return true if conditions are met for the entire string
}
console.log(test_string('xYr')); // Example usage
console.log(test_string('XXyx')); // Example usage
Output:
true false
Live Demo:
See the Pen javascript-basic-exercise-101 by w3resource (@w3resource) on CodePen.
Flowchart:
ES6 Version:
// Function to test a string based on specific conditions
const test_string = (input_str) => {
// Function to check if a symbol is a lowercase letter
const is_lower_case = (symbol) => {
if ('a' <= symbol && symbol <= 'z') {
return true;
}
return false;
}
// Function to check if a symbol is an uppercase letter
const is_upper_case = (symbol) => {
if ('A' <= symbol && symbol <= 'Z') {
return true;
}
return false;
}
// Determine if the first character is lowercase or uppercase
const is_first_char_lower = is_lower_case(input_str[0]);
const is_first_char_upper = is_upper_case(input_str[0]);
// If the first character is neither lowercase nor uppercase, return false
if (!(is_first_char_lower || is_first_char_upper)) {
return false;
}
// Iterate through the string and check conditions based on index and character case
for (let i = 1; i < input_str.length; i++) {
if (i % 2) {
if ((is_lower_case(input_str[i]) === is_first_char_lower) ||
(is_upper_case(input_str[i]) === is_first_char_upper)) {
return false;
}
} else {
if ((is_lower_case(input_str[i]) !== is_first_char_lower) ||
(is_upper_case(input_str[i]) !== is_first_char_upper)) {
return false;
}
}
}
// If all conditions are met, return true
return true;
}
console.log(test_string('xYr')); // Example usage
console.log(test_string('XXyx')); // Example usage
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