Operators

- A special function that is syntactically (written) differently 
    - Generally Operators take two parameters and return one results 

var a = 3 + 4; 
console.log(a);

How did the Javascript Engine do that? 
They Syntax Parser saw the operator (+), actually a function like this:
function + (a, b) {
    return //add the two numbers
}
Called infix operation : Operation sits in between 3 + 4 instead of + 3 4 (prefix) , 3 4 + (postfix)

Operator Precedence and Associativity

Operator Precedence:
- Which operator function gets called first 
    - Functions are called in order of Precedence (Higher precedence wins)

Example: 

var a = 3 + 4 * 5 
console.log(a);

Starts with operator precedence: 

    14
    Multiplication left‐to‐right
    ...*...

    Division left‐to‐right
    .../...

    13
    Remainder left‐to‐right
    ...%...

    Addition left‐to‐right
    ...+...

    Subtraction left‐to‐right
    ...‐...


On Chrome Dev Console:
> 23 

Associativity:
- What order operator function get called in: Left-to-right or right-to-left 
    - When functions have the same precedence

Example:

var a = 2, b = 3, c = 4;
a = b = c 

console.log(a);
console.log(b);
console.log(c);

On Chrome Dev Console:
> 4
> 4
> 4 

Reasone: Due to Associativity of the assignment operator (right-to-left)
    - So it go the furthest one to the right (c), because it is from right to left