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OPERATOR:  comparison:  ==  >  >=  <  <=  !=
The comparison operators are used to determine the relationship, in terms of equality or rank, between the values of two operands. A true, false, or invalid is returned, depending on the results of the comparison. A true signifies that the comparison was successful. A false signifies that the comparison failed. An invalid signifies that at least one of the operands is of invalid type.
 
These operators are commonly used in test conditions in if and while statements.
 
This operator uses the following format:
 
operand1  operator  operand2
 
There are certain rules that are obeyed when making a comparison:
  • true is greater in value than false.
  • The value of a character is determined by the order of the character codes in the character set being used by the browser.
  • If either or both operands are invalid, then the comparison is invalid.
There are six comparison operators.
 
 == 
The == is the comparison equal operator. This operator is used to compare the values of two operands and determine if they both have the same (equivalent) value.
 
 > 
The > is the comparison greater than operator. This operator is used to compare the values of two operands and determine if the first operand is greater in value than the second operand.
 
 >= 
The >= is the comparison greater than or equal operator. This operator is used to compare the values of two operands and determine if the first operand is greater or equal in value than the second operand.
 
 < 
The < is the comparison less than operator. This operator is used to compare the values of two operands and determine if the first operand is lesser in value than the second operand.
 
 < 
The <= is the comparison less than or equal operator. This operator is used to compare the values of two operands and determine if the first operand is lesser or equal in value than the second operand.
 
 != 
The != is the comparison not equal operator. This operator is used to compare the values of two operands and determine if the first operand is different in value than the second operand.
 
Code fragment:
...
var result1 = op1 == op2;
var result2 = op1 > op2;
var result3 = op1 >= op2;
var result4 = op1 < op2;
var result5 = op1 <= op2;
var result6 = op1 != op2;
...
while(var1 >= var2) {...}
...
if(var1 == var2) {...}
...

 


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