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Explanation :- A user gives a string (it can be incomplete lowercase or

partially in lowercase) and then the program converts it into a

completely (all characters in uppercase) uppercase string. The

logic we have used in the following program is: All the lowercase

characters (a-z) has [ASCII](https://en.wikipedia.org/wiki/ASCII) value ranging from 97 to 122 and their

corresponding uppercase characters (A-Z) have ASCII values 32

lesser than them. For example ‘a‘ has an ASCII value of 97

and ‘A‘ has an ASCII value of 65 (97 - 32). The same applies to other

characters.

/**

* upperCaseConversion takes any case-style string and converts it to the uppercase-style string.

* @param {string} inputString Any case style string

* @returns {string} Uppercase string

const upperCaseConversion = (inputString) => {

// Take a string and split it into characters.

const newString = inputString.split('').map((char) => {

// Get a character code by the use charCodeAt method.

const presentCharCode = char.charCodeAt()

// If the character code lies between 97 to 122, it means they are in the lowercase so convert it.

if (presentCharCode >= 97 && presentCharCode <= 122) {

// Convert the case by use of the above explanation.

return String.fromCharCode(presentCharCode - 32)

}

// Else return the characters without any modification.

return char

})

// After modification, with the help of the join method, join all the characters and return them.

return newString.join('')

}

export { upperCaseConversion }