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I have seen some functions defined as function(){} and some functions defined as () => {}.
Is this related to Javascript version ES6?
Also, how does use of this keyword change from one function definition to another?
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Unlike regular functions, arrow functions do not have their own this . The value of this inside an arrow function remains the same throughout the lifecycle of the function and is always bound to the value of this in the closest non-arrow parent function.
It's a new feature that introduced in ES6 and is called arrow function. The left part denotes the input of a function and the right part the output of that function.
Curly braces { } are special syntax in JSX. It is used to evaluate a JavaScript expression during compilation. A JavaScript expression can be a variable, function, an object, or any code that resolves into a value.
Regular functions created using function declarations or expressions are 'constructible' and 'callable'. Since regular functions are constructible, they can be called using the 'new' keyword. However, the arrow functions are only 'callable' and not constructible.
The () => {} is called an arrow function. They are, as you said, part of ES6. From the linked page:
An arrow function expression has a shorter syntax compared to function expressions and lexically binds the
thisvalue (does not bind its ownthis,arguments,super, ornew.target). Arrow functions are always anonymous.
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