Essential Books

Mathematic operations and assignment

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Increment by 

var a = 9,  
b = 3;  
b += a;

b will now be 12

This is functionally the same as 

b = b + a;

Decrement by 

var a = 9,  
b = 3;  
b -= a;

b will now be 6

This is functionally the same as 

b = b - a;

Multiply by 

var a = 5,  
b = 3;  
b *= a;

b will now be 15

This is functionally the same as 

b = b * a;

Divide by 

var a = 3,  
b = 15;  
b /= a;

b will now be 5

This is functionally the same as 

b = b / a;

Raised to the power of 

var a = 3,  
b = 15;  
b **= a;

b will now be 3375

This is functionally the same as 

b = b ** a;
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Declarations and assignments:
* Syntax
* Remarks
* Declaration
* Assignment
* Declaring and initializing constants
* Modifying constants
* Reassigning constants
* Undefined
* Mathematic operations and assignment
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0 Getting started
1 Comments
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3 Built-in constants
4 Variables
5 Declarations and assignments
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58 Performance Tips
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82 IndexedDB
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88 postMessage and MessageEvent
89 WeakMap
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91 Behaviroal Design Patterns
92 Server-sent events
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95 Evaluating JavaScript
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97 How to make iterator usable inside async callback function
98 Context this
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100 Vibration API
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102 Tilde
103 Security issues
104 Get and set CSS custom variables
105 Contributors