Prototypes

An object's parent is called : Prototype

The Object prototype

Has the next property functions

• valueOf
• constructor
• toLocaleString
• toString
• isPrototypeOf
• propertyIsEnumerable
• hasOwnProperty

The Array prototype

Has the next property functions

• pop()
• push()
• shift()
• reverse()
• sort()
• join()
• reduce()
• slice() 

The String prototype

Has the next property functions

• charAt()
• trim()
• concat()
• indexOf()
• replace()
• toUpperCase()
• toLowerCase()
• substring()

The number prototype

Has the next property functions

• toFixed()
• toExponential()
• toPrecision()

The function prototype

Has the next property functions

• bind()
• call()
• apply()

All of the objects inherit from the Object Prototype

Adding a function to the String Prototype

​
var witch = "I will get my phone back!"

// Adding a function to the String prototype
String.prototype.countAll = function( letter ) {
  var letterCount = 0;
  for ( var i = 0; i < this.length ; i++ ){
     if ( this.chartAt[i].toUpperCase() == letter.toUpperCase() ){
       letterCount++;
     }
  }
  return letterCount;
};

witch.countAll("I"); // This will return 2, since there are 2 i´s in the witch variable.