JavaScript Conditional statement

Conditionals expression used to run the code when condition is true

condition can be either true or false boolean value

If else and else if

If else and else if use for conditional statement and if and else if statement run when condition is true otherwise else statement run when no one condition true

Example

<script>  var x=10;  if(x==10){    alert('x equal to 10'); }else{    alert('x not equal to 10'); } </script>

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if else and else if statement

if else and else if use for more than one condition check

Example

<script>  var x=10;  if(x==15){    alert('x equal to 10'); }else if(x==10){    /* this is else if statement running */    alert('x equal to 10'); }  else{    alert('x not equal to 10'); } </script>

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Ternary operator

Ternary operator is short form of if else and if else statement

Note : condition check ? "execute when condition is true" : "execute when condition false"

Example

<script>  var x=12;  var y=12;  /* ternary operator */  x==y?"true":"false" </script>

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Inner ternary operator

In case of inner ternary operator first inner ternary operator execute then outer ternary operator execute

Example

<script>  var a=10;  var b=12;  var c=10;  /* ternary operator */  a==b?a==c?10:20:50;    /* code execute like   * a==c is true then condition like this a==b?10:50;   * a==b is false return 50   */ </script>

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Switch statement

Switch statement is like a if else and else if and provide more condition check in single  switch statement 

Example

<script>  var options=5;   switch(options){     case 1:       alert('case 1 is true');       break;     case 2:       alert('case 2 is true');       break;     case 3:       alert('case 3 is true');       break;     default:       alert('no case is true');       break;   }; </script>

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Note : if you do not use break keyword then all case run after true case

default statement run when no one cases are true

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