Nodejs String Case Convert toAlternatingCase()

Method Source Code

// Define String.prototype.toAlternatingCase (StringUtils.toAlternatingCase(String) 
//    in Java) such that each lowercase letter becomes uppercase and each uppercase letter 
// becomes lowercase. 

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());//from ww w. j a v  a2  s. co  m
    } else if ((char.charCodeAt(0) >= 65) && (char.charCodeAt(0) <= 90)){
      result.push(char.toLowerCase());
    } else {
      result.push(char);
    }
  });
  return result.join("");
}

Related

1. toAkaLowerCase()

   String.prototype.toAkaLowerCase = function() {
       var integer=0,i;
       var newString="";
       for(i=0;i<this.length;i++){
         var integer = this.charCodeAt(i);
         if(integer>=65 && integer<=90){
           integer=integer+32;
           newString=newString+String.fromCharCode(integer);
         else{
           newString=newString+String.fromCharCode(integer);
       return newString;
     };
   

2. 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;
   };
   

3. toAlternatingCase()

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

4. 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;
   

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 () {
     return this.toString().split('')
                           .map(l => l.match(/[a-z]/)  ? l.toUpperCase() : l.toLowerCase())
                           .join('');
   

7. 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];
   ...
   

8. snakeCase()

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