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Difference between ES5 and ES6
  • Last Updated : 29 Dec, 2020

1. ECMAScript 5 (ES5P) : 
ES5 is also known as ECMAScript 2009 as it is released in 2009. It is a function contractors focus on how the objects are instantiated. For ES5 you have to write function keyword and return, to be used to define the function, like normal general JavaScript language. 

2. ECMAScript 6 (ES6) : 
ES6 is also known as ECMAScript 2015 as it is released in 2015. Its class allows the developers to instantiate an object using the new operator, using an arrow function, in case it doesn’t need to use function keyword to define the function, also return keyword can be avoided to fetch the computer value. 

Difference between ES5 and ES6 : 

SR.NO. ES5 ES6
1. ECMA script is a trademarked scripting language specification defined by Ecma international. The fifth edition of the  same is known as ES5 ECMA script is a trademarked scripting language specification defined by Ecma international. The sixth edition of the same is known as ES6 
2. It was introduced in 2009. It was introduced in 2015.
3. It supports primitive data types that are string, number, boolean, null, and undefined.  In ES6, there are some additions to JavaScript data types. It introduced a new primitive data type ‘symbol’ for supporting unique values.
4. There are only one way to define the variables by using the var keyword. There are two new ways to define variables that are let and const.
5. It has a lower performance as compared to ES6. It has a higher performance than ES5.
6. Object manipulation is time-consuming in ES5. Object manipulation is less time-consuming in ES6.
7. In ES5, both function and return keywords are used to define a function. An arrow function is a new feature introduced in ES6 by which we don’t require the function keyword to define the function.
8. It provides a larger range of community supports than that of ES6 It provides a less range of community supports than that of ES5

 

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