g operator ](/en-
US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing) .

###  Conversion rules for booleans

####  Converting AND to OR

The following operation involving **booleans** :

js

    
    
    bCondition1 && bCondition2
    

is always equal to:

js

    
    
    !(!bCondition1 || !bCondition2)
    

####  Converting OR to AND

The following operation involving **booleans** :

js

    
    
    bCondition1 || bCondition2
    

is always equal to:

js

    
    
    !(!bCondition1 && !bCondition2)
    

###  Removing nested parentheses

As logical expressions are evaluated left to right, it is always possible to
remove parentheses from a complex expression following some rules.

The following composite operation involving **booleans** :

js

    
    
    bCondition1 && (bCondition2 || bCondition3)
    

is always equal to:

js

    
    
    !(!bCondition1 || !bCondition2 && !bCondition3)
    

##  Specifications

Specification  
---  
[ ECMAScript Language Specification  
#  prod-LogicalORExpression  ](https://tc39.es/ecma262/multipage/ecmascript-
language-expressions.html#prod-LogicalORExpression)  
  
##  Browser compatibility

BCD tables only load in the browser  with JavaScript enabled. Enable
JavaScript to view data.

##  See also

  * [ Nullish coalescing operator ( ` ?? ` ) ](/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing)
  * [ ` Boolean ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean)
  * [ Truthy ](/en-US/docs/Glossary/Truthy)
  * [ Falsy ](/en-US/docs/Glossary/Falsy)

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