Nodejs String Case Convert toAlternatingCase()

Method Source Code

// altERnaTIng cAsE <=> ALTerNAtiNG CaSe
// Define to_alternating_case(char*) such that each lowercase letter becomes
// uppercase and each uppercase letter becomes lowercase.
// For example://www .j a va2  s.co  m
// char source[] = "hello world";
// char *upperCase = to_alternating_case(source);
// (void)puts(upperCase); // outputs: HELLO WORLD
// char source[] = "HELLO WORLD";
// char *upperCase = to_alternating_case(source);
// (void)puts(upperCase); // outputs: hello world
// char source[] = "HeLLo WoRLD";
// char *upperCase = to_alternating_case(source);
// (void)puts(upperCase); // outputs: hEllO wOrld

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];
    }
  }
  return output;
}
console.log('hello world'.toAlternatingCase(), '|', 'HELLO WORLD');
console.log('HELLO WORLD'.toAlternatingCase(), '|', 'hello world');
console.log('12345'.toAlternatingCase(), '|', '12345');
console.log('1a2b3c4d5e'.toAlternatingCase(), '|', '1A2B3C4D5E');

Related

1. toAlternatingCase()

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

2. 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;
   

3. 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 {
   ...
   

4. 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;
   

5. toAlternatingCase()

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

6. snakeCase()

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

7. snakeCaseDash()

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

8. snake_case()

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

9. toSnakeCase()

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