Nodejs String to Upper Case toUpperCaseFirst()

Method Source Code

String.prototype.toUpperCaseFirst = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
};

Related

1. toUpper()

   String.prototype.toUpper = function() {
     var pattern = /[a-z]/g;
     return this.replace(pattern, function(args) {
       return String.fromCharCode(args.charCodeAt() - 32);
     });
   };
   

2. toUpper()

   String.prototype.toUpper = function(){
     result = this.replace(/[a-z]/g, function(x){
       return x.toUpperCase();
     });
     return result;
   };
   

3. toUpper()

   String.prototype.toUpper = function() {
     return this.replace(/([a-z])/g, function(match){
       return String.fromCharCode(match.charCodeAt(0) - 32);
     });
   };
   

4. toUpper()

   String.prototype.toUpper = function() {
     return this.replace(/[a-z]/g, function(x) {
       return String.fromCharCode(x.charCodeAt(0) - 32);
     });
   

5. toUpperCase()

   String.prototype.toUpperCase = function() {
     var s = "";
     for (var i = 0, len = this.length; i < len; i++) {
       var char = this.charCodeAt(i);
       if (char >= 97 && char <= 122) {
         s += String.fromCharCode(char - 32);
       } else {
         s += this[i];
     return s;
   };
   

6. toUpperCaseFirst()

   String.prototype.toUpperCaseFirst = function() {
       return this[0].toUpperCase() + this.substr(1);
   };
   

7. toUpperCaseFirst()

   String.prototype.toUpperCaseFirst = function() {
     return this.slice(0,1).toUpperCase() + this.slice(1).toLowerCase();
   };
   

8. toUpperCaseFirstLetter()

   window.upperCaseFirstLetter = (str)=>{
     return str.replace(/^\w/, function(w){return w.toUpperCase()});
   String.prototype.toUpperCaseFirstLetter = function(){
     return upperCaseFirstLetter(this);
   

9. toUpperLowerCase()

   String.prototype.toUpperLowerCase = function() {
       var string = this.split("");
       string[0] = string[0].toUpperCase();
       return string.join("");
   };