Here's an example solution in JavaScript:

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function alternateCase(str) {
  let result = '';
  for (let i = 0; i < str.length; i++) {
    if (str[i] === str[i].toUpperCase()) {
      result += str[i].toLowerCase();
    } else {
      result += str[i].toUpperCase();
    }
  }
  return result;
}

// Example usage:
console.log(alternateCase('Hello World!')); // Output: hELLO wORLD!

In this solution, we create a function called alternateCase that takes a string str as a parameter. It uses a for loop to iterate over each character in the string. Inside the loop, we check if the character is uppercase using the toUpperCase() method. If it is uppercase, we convert it to lowercase using the toLowerCase() method and append it to the result variable. If it is lowercase, we convert it to uppercase and append it to result. Finally, we return the result string.

You can use the console.log function to test the solution with the provided example string and check the output.

text-transform is a CSS property that allows you to control the capitalization and case of text within an element. It takes various values such as uppercase, lowercase, capitalize, and none.

For example, if you set text-transform: uppercase;, all the text within the element will be converted to uppercase letters. Similarly, if you set text-transform: capitalize;, the first character of each word within the element will be converted to uppercase.

You can find more information and examples in the following link: MDN Web Docs - text-transform

To write a function that returns the whole string in uppercase, you can use the built-in toUpperCase() method in JavaScript. Here's an example:

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function convertToUpperCase(str) {
  return str.toUpperCase();
}

// Example usage
console.log(convertToUpperCase("hello")); // Output: HELLO
console.log(convertToUpperCase("sheCodes")); // Output: SHECODES

In the convertToUpperCase function, we pass in a string str as an argument. We then use the toUpperCase() method to convert the string to uppercase and return the result.

To uppercase text in CSS, you can use the text-transform property with the value of uppercase. This will transform all text within the targeted element to uppercase.

Example:

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<style>
    .uppercase-text {
        text-transform: uppercase;
    }
</style>

<p class="uppercase-text">example text</p>

This will display "EXAMPLE TEXT" in uppercase.

To get JavaScript to disregard uppercase letters, you'll need to convert all letters in a string to the same case (either lowercase or uppercase) so that they can be compared as equal. You can achieve this using the toLowerCase() or toUpperCase() method in JavaScript.

Here's an example in JavaScript:

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let string1 = "Hello World";
let string2 = "heLLo wORld";

if (string1.toLowerCase() === string2.toLowerCase()) {
  console.log("The strings are equal!");
} else {
  console.log("The strings are different.");
}

This code will output "The strings are equal!" because we're converting both string1 and string2 to lowercase before comparing them. By converting them to lowercase, we've made the comparison case-insensitive.

You can make an if statement work with lower and uppercase spelling by converting the input to either lowercase or uppercase using a string method.

Here's an example in Python:

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input = "Hello"
if input.lower() == "hello":
   print("The input is 'hello'.")
elif input.upper() == "HELLO":
   print("The input is 'HELLO'.")
else:
   print("The input is not 'hello' or 'HELLO'.")

In this example, the lower() and upper() methods are used to convert the input variable to lowercase and uppercase, respectively. This allows the if statement to check for both lowercase and uppercase versions of the string "hello". If the input matches either the lowercase or uppercase version of "hello", the corresponding print statement will be executed. Otherwise, the else statement will be executed.

To change a text input to uppercase you can use the toUpperCase() method in JavaScript.

Here's an example of code that changes the input text to uppercase when the user types:

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<input type="text" id="myInput">

<script>
  const inputField = document.getElementById("myInput");

  inputField.addEventListener("keyup", function(event) {
    event.preventDefault();
    inputField.value = inputField.value.toUpperCase();
  });
</script>

In this example, we're selecting the input field using getElementById(), and then we're adding an event listener to it that listens for the keyup event, which happens every time the user types a key.

Then, in the event listener, we're using the toUpperCase() method to convert the input value to uppercase characters. Finally, we're setting the input's value using .value.

You can try this code in action here: https://codepen.io/shecodes/pen/qBaNVoR

To change the case of a string in JavaScript, you can use the toUpperCase() method to convert all characters in the string to uppercase or toLowerCase() method to convert all characters in the string to lowercase.

Example code to change a string to uppercase:

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const myString = "Hello, World!";
const upperCaseString = myString.toUpperCase();
console.log(upperCaseString); //Output: "HELLO, WORLD!"

Example code to change a string to lowercase:

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const myString = "Hello, World!";
const lowerCaseString = myString.toLowerCase();
console.log(lowerCaseString); //Output: "hello, world!"

In React.js, you can use these methods in your render() function to change the case of a string as needed.

You can use the toUpperCase() function in JavaScript to uppercase just the first letter as shown in the example below:

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let text = "hello world";
let firstChar = text.charAt(0).toUpperCase();
let otherChars = text.slice(1).toLowerCase();  
let result = firstChar + otherChars;
console.log(result); // Outputs: "Hello world" 

You can use String.toLowerCase() in a JavaScript if statement to convert strings to all lowercase letters, and make them insensitive to uppercase or typos.

For example, the following code snippet parses an input string inputString to all lowercase letters and compares it to the string example.

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if (inputString.toLowerCase() === 'example') {
  // run a block of code
}

In most programming languages, you can allow both capital and lowercase spellings by using the .lower() or .upper() methods.

For example, in JavaScript you can use .toLowerCase() or .toUpperCase() methods to convert strings to either all lowercase or all uppercase characters.

For example:

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let name = 'Hermione';
let upperName = name.toUpperCase(); //HERMIONE
let lowerName = name.toLowerCase(); //hermione

References:

• MDN Web Docs - String.prototype.toLowerCase()
• MDN Web Docs - String.prototype.toUpperCase()