JavaScript: Test case insensitive (except special Unicode characters) string comparison

JavaScript String: Exercise-37 with Solution

Case-Insensitive Compare

Write a JavaScript function to test case-insensitive (except special Unicode characters) string comparison.

Test Data:
console.log(compare_strings('abcd', 'AbcD'));
true
console.log(compare_strings('ABCD', 'Abce'));
false

Visual Presentation:

Sample Solution:

JavaScript Code:

// Define a function named compare_strings that takes two string parameters: str1 and str2
function compare_strings(str1, str2) {
    // Convert both strings to uppercase and check if they are equal
    var areEqual = str1.toUpperCase() === str2.toUpperCase();
    // Return the result of the comparison
    return areEqual;
}

// Test the function by comparing two pairs of strings and print the results
console.log(compare_strings('abcd', 'AbcD')); // Output: true
console.log(compare_strings('ABCD', 'Abce')); // Output: false

Output:

true
false

Explanation:

In the exercise above,

JavaScript code defines a function called "compare_strings()" that takes two string parameters 'str1' and 'str2'. Inside the function:

• Both input strings 'str1' and 'str2' are converted to uppercase using the "toUpperCase()" method.
• The equality of the two uppercase strings is checked using the '===' operator, and the result is stored in the variable 'areEqual'.
• Finally, the function returns the boolean value 'areEqual', which indicates whether the two input strings are equal, regardless of their case.

Flowchart:

Live Demo:

See the Pen JavaScript Test case insensitive (except special Unicode characters) string comparison-string-ex-37 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that compares two strings for equality, ignoring differences in letter case.
• Write a JavaScript function that converts both strings to lowercase before comparison.
• Write a JavaScript function that uses localeCompare() with sensitivity set to base to perform case-insensitive comparisons.
• Write a JavaScript function that returns true if two strings match regardless of case and false otherwise.

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