Add JS reference article: Assignment Operators

JS-Assignment-Operators.md

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+# JavaScript Assignment Operators
+
+
+### Introduction
+
+Assignment operators, as the name suggests, assign (or re-assign) values to a variable. While there are quite a few variations on the assignment operators, they all build off of the basic assignment operator.
+
+
+## Syntax
+
+```javascript
+x = y;
+```
+
+          | Description                                   | Necessity
+--------- | --------------------------------------------- | ---------
+x         | Variable                                      | Required
+=         | Assignment operator                           | Required
+y         | Value to assign to variable                   | Required
+
+[MDN link](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Assignment)
+[MSDN link](https://msdn.microsoft.com/en-us/library/1w2h1k9x(v=vs.94).aspx)
+
+
+## Examples
+
+```javascript
+let initialVar = 5;   // Variable initialization requires the use of an assignment operator
+```
+
+```javascript
+let newVar = 5;
+newVar = 6;   // Variable values can be modified using an assignment operator
+```
+
+
+## Variations
+
+The other assignment operators are a shorthand for performing some operation using the variable (indicated by x above) and value (indicated by y above) and then assinging the result to the variable itself.
+
+For example, below is the syntax for the addition assignment operator:
+
+```javascript
+x += y;
+```
+
+This is the same as applying the addition operator and reassigning the sum to the original variable (i.e., x), which can be expressed by the following code:
+
+```javascript
+x = x + y;
+```
+
+To illustrate this using actual values, here is another example of using the addition assignment operator:
+
+```javascript
+let myVar = 5;   // value of myVar: 5
+myVar += 7;   // value of myVar: 12 = 5 + 7
+```
+
+
+## Complete list of Javascript's assignment operators
+
+ Operator                       | Syntax    | Long version
+------------------------------- | --------- | -------------
+Assignment                      | x = y     | x = y
+Addition assignment             | x += y    | x = x + y
+Subtraction assignment          | x -= y    | x = x - y
+Multiplication assignment       | x *= y    | x = x * y
+Division assignment             | x /= y    | x = x / y
+Remainder assignment            | x %= y    | x = x % y
+Exponentiation assignment       | x **= y   | x = x ** y
+Left shift assignment           | x <<= y   | x = x << y
+Right shift assignment          | x >>= y   | x = x >> y
+Unsigned right shift assignment | x >>>= y  | x = x >>> y
+Bitwise AND assignment          | x &= y    | x = x & y
+Bitwise XOR assignment          | x ^= y    | x = x ^ y
+Bitwise OR assignment           | x |= y    | x = x | y
+