Monday, November 28, 2016

JavaScript, Comparison operators Tip

Reference to :  
JavaScript has both strict and type–converting comparisons.
1-  Strict comparison ( === ) : is True if the operands are of the same type and the contents match.
2- Type–converting comparisons ( == ) :  converts the operands to the same type before making the comparison. 


Briefly : 
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== only compares values
=== compares values + type
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0 == false   // true
0 === false  // false, because they are of a different type
1 == "1"     // true, automatic type conversion for value only
1 === "1"    // false, because they are of a different type
null == undefined // true
null === undefined // false
'0' == false // true
'0' === false // false

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