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JAVASCRIPT
       COMPARISON AND
     LOGICAL OPERATORS
BENJAMIN B. ESGUERRA MEMORIAL NATIONAL HIGH
                  SCHOOL
JavaScript Comparison and Logical
Operators

  Comparison and Logical operators are
   used to test for true or false.
  Comparison Operators are used in
   logical statements to determine equality
   or difference between variables or values.
  Logical Operators are used to determine
   the logic between variables or values.
COMPARISON OPERATORS
 Given that x=5, the table below explains the comparison operators.

Operator                 Description                 Comparing   Returns
                                                  x==8            FALSE
   ==      is equal to                            x==5            TRUE
                                                  x==="5"         FALSE
           is exactly equal to (value and type)   x===5           TRUE
   !=      is not equal                           x!=8            TRUE
                                                  x!=="5"         TRUE
  !==      is not equal (neither value or type)   x!==5           FALSE
   >       is greater than                        x>8             FALSE
   <       is less than                           x<8             TRUE
  >=       is greater than or equal to            x>=8            FALSE
  <=       is less than or equal to               x<=8            TRUE
EXAMPLE
<html>
<body>
<script>
var x= 10
var y= 2
var z= (x>y);
confirm("Is "+x+" greater
than "+y+" ?");
alert(""+z+"");
</script>
</body>
</html>
EXAMPLE
<html>
<body>
<script>
var x= parseFloat(prompt(“Enter
  the first value”,””));
var y= parseFloat(prompt(“Enter
  the second value”,””));
confirm(“Is”+x+”
var z= (x>y);
alert(""+z+"");
</script>
</body>
</html>
LOGICAL OPERATORS
Given that x=6 and y=3 the table below explains the logical
operators.



Operator       Description          Comparing            Returns
    &&
(ampersand)         and            (x<10 && y>1)              TRUE

     ||              or             (x==5||y==5)              FALSE

     !              not                !(x==y)                TRUE
<script>
var x= 10
var y= 2
var z= (x>y && y<x)
confirm("Is "+x+" greater than "+y+" ?, and
  "+y+" is less than "+x+" ?");
alert(""+z+"");
</script>
</body>
</html>
CONDITIONAL OPERATOR
 JavaScript also contains a conditional operator that assigns a
 value to a variable based on some conditions.

SYNTAX:

variable name= (condition)? value1:value2

Example:
If the variable age is value below 18, the value of the
   variable voteable will be “Too young, otherwise the
   value of votaable will be “Old enough”

var age= 18
var voteable= (age<18)? “Too young”:”Old
 enough”
<html>
<body>
<script>
var x= prompt("Who created the JavaScript? "," ");
var y= “Brendan Eich"
var z= (x==y)?"Correct": "Wrong";
alert(""+z+"");
document.write("Correct Answer: "+y+"");
</script>
</body>
</html>
Assign/Seatwork
Create the JavaScript source code

COMPARISON
50 is less than 68

LOGICAL
50 is equal to 68 and 68 is equal to 50

CONDITIONAL
What is the first calculating device? Abacus
  or Comptometer?
Condition: Congratulation! And Try Again
Ad

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Javascript comparison and logical operators

  • 1. JAVASCRIPT COMPARISON AND LOGICAL OPERATORS BENJAMIN B. ESGUERRA MEMORIAL NATIONAL HIGH SCHOOL
  • 2. JavaScript Comparison and Logical Operators  Comparison and Logical operators are used to test for true or false.  Comparison Operators are used in logical statements to determine equality or difference between variables or values.  Logical Operators are used to determine the logic between variables or values.
  • 3. COMPARISON OPERATORS Given that x=5, the table below explains the comparison operators. Operator Description Comparing Returns x==8 FALSE == is equal to x==5 TRUE x==="5" FALSE is exactly equal to (value and type) x===5 TRUE != is not equal x!=8 TRUE x!=="5" TRUE !== is not equal (neither value or type) x!==5 FALSE > is greater than x>8 FALSE < is less than x<8 TRUE >= is greater than or equal to x>=8 FALSE <= is less than or equal to x<=8 TRUE
  • 4. EXAMPLE <html> <body> <script> var x= 10 var y= 2 var z= (x>y); confirm("Is "+x+" greater than "+y+" ?"); alert(""+z+""); </script> </body> </html>
  • 5. EXAMPLE <html> <body> <script> var x= parseFloat(prompt(“Enter the first value”,””)); var y= parseFloat(prompt(“Enter the second value”,””)); confirm(“Is”+x+” var z= (x>y); alert(""+z+""); </script> </body> </html>
  • 6. LOGICAL OPERATORS Given that x=6 and y=3 the table below explains the logical operators. Operator Description Comparing Returns && (ampersand) and (x<10 && y>1) TRUE || or (x==5||y==5) FALSE ! not !(x==y) TRUE
  • 7. <script> var x= 10 var y= 2 var z= (x>y && y<x) confirm("Is "+x+" greater than "+y+" ?, and "+y+" is less than "+x+" ?"); alert(""+z+""); </script> </body> </html>
  • 8. CONDITIONAL OPERATOR JavaScript also contains a conditional operator that assigns a value to a variable based on some conditions. SYNTAX: variable name= (condition)? value1:value2 Example: If the variable age is value below 18, the value of the variable voteable will be “Too young, otherwise the value of votaable will be “Old enough” var age= 18 var voteable= (age<18)? “Too young”:”Old enough”
  • 9. <html> <body> <script> var x= prompt("Who created the JavaScript? "," "); var y= “Brendan Eich" var z= (x==y)?"Correct": "Wrong"; alert(""+z+""); document.write("Correct Answer: "+y+""); </script> </body> </html>
  • 10. Assign/Seatwork Create the JavaScript source code COMPARISON 50 is less than 68 LOGICAL 50 is equal to 68 and 68 is equal to 50 CONDITIONAL What is the first calculating device? Abacus or Comptometer? Condition: Congratulation! And Try Again
  翻译: