Nodejs String Starts With startsWith(text)

Method Source Code

// Native Object Prototypes

console.log(typeof Array.prototype.sort);               // function
console.log(typeof String.prototype.substring);      // function

String.prototype.startsWith = function (text) {
   return this.indexOf(text) === 0;
};

var msg = 'Hello world!';
console.log(msg.startsWith('Hello'));   // true

Related

1. startsWith(substring)

   String.prototype.startsWith = function (substring) {
       var stringCut = this.substring(0, substring.length);
       return stringCut === substring;
   

2. startsWith(substring)

   "use strict";
   String.prototype.startsWith  = function(substring) {
       var substringLength = substring.length;
       if (substringLength > this.length) {
           return false;
       var i;
       for (i = 0; i < substringLength; i += 1) {
           if (substring[i] !== this[i]) {
   ...
   

3. startsWith(substring)

   String.prototype.startsWith = function(substring) {
       var compareString = this.substring(0, substring.length);
       return compareString === substring;
   };
   

4. startsWith(suffix)

   String.prototype.startsWith = function(prefix) {
     return (this.indexOf(prefix) == 0);
   };
   module.exports = {};
   

5. startsWith(suffix)

   String.prototype.startsWith = function (suffix) {
       return !(this.indexOf(suffix) !== 0);
   };
   

6. startsWith(text)

   String.prototype.startsWith = function (text) {
       return this.indexOf(text) == 0;
   };
   var msg = "Hello world!";
   print(msg.startsWith("Hello"));   
   

7. startsWith(text)

   String.prototype.startsWith = function (text) {
     return this.substring(0, text.length) === text;
   };
   

8. startsWith(text)

   String.prototype.startsWith = function(text) {
       return text != null && this.indexOf(text) == 0;
   };
   

9. startsWith(value)

   String.prototype.startsWith=  function(value)
       if (value.length <= this.length)
           return this.substring(0, value.length) == value;
       return false;
   };