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Javascript Decision Making

Decision Making statements are if, else, elseif and switch these statements are used in making decisions.



if..else statements

if..else statements is used where you want to execute a set of code when a condition is true and another if the condition is not true

Syntax


if (condition)
{
  code to be executed if condition is true
}
else
{
  code to be executed if condition is false
}


Example of if..else

var a=10;
if (a==10)
{
  echo "Yes the value is 10"; 
}
else
{
  echo "No the value is not 10"; 
}



elseif statements

elseif statements is used where you want to execute a some code if one of several conditions are true use the elseif statement


Syntax


if (condition)
{
  code to be executed if condition is true
}
elseif (condition)
{
  code to be executed if condition is true;
}
else
{
  code to be executed if condition is false
}


Example of elseif

var a=10;
if (a==20)
{
  echo "Yes the value is 20"; 
}
elseif(a==10)
{
  echo "Yes the value is 10"; 
}
else
{
  echo "No you are wrong"; 
}



switch statements

switch statements is used where you want to execute one block of code out of many.


Syntax


switch (value)
{
case value1:
  code to be executed if value = value1;
  break;  

case value2:
  code to be executed if value = value2;
  break;

default:
  code to be executed
  if value is different 
  from both value1 and value2;
}


Example of switch

var a=10;
switch ( a )
{
case 10:
  code to be executed if var a=10;
  break;  

case 20:
  code to be executed if var a=20;
  break;

default:
  code to be executed
  if value is different 
  from both value1 and value2;

}
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