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Alternate casing a string in JavaScript
We are required to write a JavaScript function that takes in a string and constructs a new string with all the uppercase characters from the original string converted to lowercase and all the lowercase characters converted to uppercase from the original string.
For example: If the string is −
const str = 'The Case OF tHis StrinG Will Be FLiPped';
Output
Then the output should be −
const output = 'tHE cASE of ThIS sTRINg wILL bE flIpPED';
Example
The code for this will be −
const str = 'The Case OF tHis StrinG Will Be FLiPped';
const isUpperCase = char => char.charCodeAt(0) >= 65 && char.charCodeAt(0)<= 90;
const isLowerCase = char => char.charCodeAt(0) >= 97 && char.charCodeAt(0) <= 122;
const flipCase = str => {
let newStr = '';
const margin = 32;
for(let i = 0; i < str.length; i++){
const curr = str[i];
if(isLowerCase(curr)){
newStr += String.fromCharCode(curr.charCodeAt(0) - margin);
}else if(isUpperCase(curr)){
newStr += String.fromCharCode(curr.charCodeAt(0) + margin);
}else{
newStr += curr;
};
};
return newStr;
};
console.log(flipCase(str));Output
The output in the console −
tHE cASE of ThIS sTRINg wILL bE flipped
Updated on: 15-Oct-2020
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