# JavaScript : break & continue Keywords

### What is break keyword?

The break keyword is used for

* Exiting from a loop
    
* Exiting from a loop to a label
    
* Exiting from a block to a label
    

### Using break keyword

* Case 1 : Inside a loop
    
    ```javascript
    
    let i=10;
    while (true) {
        i++;
        if (i>15)
         break;
    }
    
    console.log("i", i); // 16
    ```
    
    In the above code the the while is exited when i is 16.
    
* Case 2: Exiting from a loop to a label
    
    ```javascript
    outer: for (let i=0;i<10;i++) {  // outer label
        console.log("for i", i); // for i 0
        for (let j=2;j<10;j++) {
            if (j==5) 
                break outer;
        }    
    }
    console.log("after for loop");
    ```
    
    In the above code the inner for loop is exited to outer label.
    
* Case 3: Exiting from a code block to a label
    
    ```javascript
    
    flagpost: {  // flagpost label
        console.log("inside block");
        break flagpost;
        console.log("inside block 2");  // not executed 
     }
     console.log("after code block");
    ```
    

In the above code the code block is exited to label flagpost.

### What is continue keyword?

The continue keyword is used for

* To skip instructions in loop and return the control back to start of loop
    

### Using continue Keyword

* Case 1
    
    ```javascript
    let i=2;
    while(i<10) { 
      i++;
      if (i> 6)
         console.log(i);
      else
         continue;   
      console.log("After if");
    }
    ```
    
    In the above code 'After if' is printed when i is greater than 6. When i less than 7 control is returned back to start of loop.
    
* Case 2
    
    ```javascript
    let i=2;
    while(i<10) {
        (i < 6) ? console.log(i): continue; 
        i++;
    }
    ```
    
    The above code will yield into error because continue keyword cannot be used with ternary operator.
    

### Complete Code Listing

```javascript
//Objective : Using break and continue keywords
//Author : Mahavir
let i=10;
while (true) {
    i++;
    if (i>15)
     break;
}

console.log("i", i); // 16

outer: for (let i=0;i<10;i++) {  // outer label
    console.log("for i", i); // for i 0
    for (let j=2;j<10;j++) {
        if (j==5) 
            break outer;
    }    
}
console.log("after for loop");


flagpost: {  // flagpost label
    console.log("inside block");
    break flagpost;
    console.log("inside block 2");  // not executed 
 }
 console.log("after code block");


i=2;
while(i<10) { 
  i++;
  if (i> 6)
     console.log(i);
  else
     continue;   
  console.log("After if");
}

i=2;
while(i<10) {
    (i < 6) ? console.log(i): continue;  // error
    i++;
}
```