How to use Relational Operators in Javascript

Description

Relational operators perform comparisons between values.

The Relational Operators in Javascript are listed as follows.

• less-than <
• greater-than >
• less-than-or-equal-to <=
• greater-than-or-equal-to >=

Special rules

Special rules are as follows:

• If the operands are numbers, perform a numeric comparison.
• If the operands are strings, compare the character codes of each corresponding character in the string.
• If one operand is a number, convert the other operand to a number and perform a numeric comparison.
• If an operand is an object, call valueOf() and use its result to perform the comparison.
• If valueOf() is not available, call toString() and use that value.
• If an operand is a Boolean, convert it to a number and perform the comparison.

Example

Character codes of uppercase letters are lower than the character codes of lowercase letters.

var result = "B" < "a";  //true
console.log(result);
result = "B".toLowerCase() < "a".toLowerCase();  //false
console.log(result);

In the following code both operands are strings, they are compared by their character codes).

var result = "23" < "3";  //true
console.log(result);

In the following code the string "23" is converted into the number 23 and then compared to 3.

var result = "23" < 3;    //false
console.log(result);

Example 2

var result1 = 5 > 3;    //true
console.log(result1);/*from w w w.  ja va 2s. c om*/
    result2 = 5 < 3;    //false
console.log(result2);
    result = "a" < 3;    //because "a" becomes NaN
console.log(result);
    result1 = NaN < 3;    //false
console.log(result1);
    result2 = NaN >= 3;   //false
console.log(result2);

The code above generates the following result.