Nodejs String Case Convert toAlternatingCase()

Method Source Code

//https://www.codewars.com/kata/alternating-case-%3C-equals-%3E-alternating-case/train/javascript
String.prototype.toAlternatingCase = function () {
  return this.toString().split('')
                        .map(l => l.match(/[a-z]/)  ? l.toUpperCase() : l.toLowerCase())
                        .join('');
}
//without toString possible

Related

1. toAkaUpperCase()

   String.prototype.toAkaUpperCase = function() {
     var integer=0,i;
     var newString="";
     for(i=0;i<this.length;i++){
       var integer = this.charCodeAt(i);
       if(integer>=97 && integer<=122){
         integer=integer-32;
         newString=newString+String.fromCharCode(integer);
       else{
         newString=newString+String.fromCharCode(integer);
     return newString;
   };
   

2. toAlternatingCase()

   String.prototype.toAlternatingCase = function() {
     return [...this].map(
       (c) => (c === c.toUpperCase() ? c.toLowerCase() : c.toUpperCase()),
     ).join``;
   };
   

3. toAlternatingCase()

   String.prototype.toAlternatingCase = function () {
     var _str = ""; 
     for(var _c = 0; _c < this.length; _c++){
       _str += ((this[_c] === this[_c].toUpperCase())? this[_c].toLowerCase() : this[_c].toUpperCase());
     return _str;
   

4. toAlternatingCase()

   String.prototype.toAlternatingCase = function () {
     var result = [];
     var letters = this.split("");
     letters.forEach(function(char) {
       if ((char.charCodeAt(0) >= 97) && (char.charCodeAt(0) <= 122)) {
         result.push(char.toUpperCase());
       } else if ((char.charCodeAt(0) >= 65) && (char.charCodeAt(0) <= 90)){
         result.push(char.toLowerCase());
       } else {
   ...
   

5. toAlternatingCase()

   String.prototype.toAlternatingCase = function () {
     var newStr = "";
     for (var i = 0; i < this.length; i++){
       if (this.charAt(i).toUpperCase() === this.charAt(i)){
          newStr += this.charAt(i).toLowerCase();
       } else {
          newStr += this.charAt(i).toUpperCase();  
     return newStr;
   

6. toAlternatingCase()

   String.prototype.toAlternatingCase = function() {
     var output = '';
     for (var i=0; i<this.length; i++) {
       if (this[i].toLowerCase() === this[i]) {
         output = output + this[i].toUpperCase();
       } else if (this[i].toUpperCase() === this[i]) {
         output = output + this[i].toLowerCase();
       } else {
         output = output + this[i];
   ...
   

7. snakeCase()

   String.prototype.snakeCase = function() {
     return this.replace( /([A-Z])/g, function( $1 ) {return "_" + $1.toLowerCase();} );
   };
   

8. snakeCaseDash()

   String.prototype.snakeCaseDash = function() {
     return this.replace( /([A-Z])/g, function( $1 ) {return "-" + $1.toLowerCase();} );
   };
   

9. snake_case()

   String.prototype.snake_case = function(){
       return this
           .replace( /[A-Z]/g, function($1) { return '_' + $1 } )
           .toLowerCase();