LABEL WITH BREAK / CONTINUE IN FOR LOOP

Break outerloop

var str = 0;

outerloop:
for (var i = 0; i < 3; i++) {
  console.log("I: " + i); 
  innerloop:
  for(var j = 0; j < 5; j++) {
    if(j === 2) {
      break outerloop;
    }
   console.log("JJ: " + j);  
  }
 str++;
}
console.log('STR: ' + str);

/*
"I: 0"
"JJ: 0"
"JJ: 1"
"STR: 0"
*/

Continue outerloop

var str = 0;

outerloop:
for (var i = 0; i < 3; i++) {
  console.log("I: " + i); 
  innerloop:
  for(var j = 0; j < 5; j++) {
    if(j === 2) {
      continue outerloop;
    }
   console.log("JJ: " + j);  
  }
 str++;
}
console.log('STR: ' + str);

/*
"I: 0"
"JJ: 0"
"JJ: 1"
"I: 1"
"JJ: 0"
"JJ: 1"
"I: 2"
"JJ: 0"
"JJ: 1"
"STR: 0"
*/

Break innerloop

var str = 0;

outerloop:
for (var i = 0; i < 3; i++) {
  console.log("I: " + i); 
  innerloop:
  for(var j = 0; j < 5; j++) {
    if(j === 2) {
      break innerloop;
    }
   console.log("JJ: " + j);  
  }
 str++;
}
console.log('STR: ' + str);

/*
"I: 0"
"JJ: 0"
"JJ: 1"
"I: 1"
"JJ: 0"
"JJ: 1"
"I: 2"
"JJ: 0"
"JJ: 1"
"STR: 3"
*/

Continue innerloop

var str = 0;

outerloop:
for (var i = 0; i < 3; i++) {
  console.log("I: " + i); 
  innerloop:
  for(var j = 0; j < 5; j++) {
    if(j === 2) {
      continue innerloop;
    }
   console.log("JJ: " + j);  
  }
 str++;
}
console.log('STR: ' + str);

/*
"I: 0"
"JJ: 0"
"JJ: 1"
"JJ: 3"
"JJ: 4"
"I: 1"
"JJ: 0"
"JJ: 1"
"JJ: 3"
"JJ: 4"
"I: 2"
"JJ: 0"
"JJ: 1"
"JJ: 3"
"JJ: 4"
"STR: 3"
*/

LABEL WITH BREAK / CONTINUE IN WHILE LOOP

Break outerloop

var a = 0;

outerloop: 
while(a < 5) {
  console.log('A-first: ' + a);
  for(var b = 0; b < 3; b++) {
    console.log('--B-first: ' + b);
    if(b === 2) {
     break outerloop;
     console.log('--B-last: '+ b);
    }
  }
  console.log('A-last: ' + a);
  a++;
}
console.log('Final A: ' + a);

/*
"A-first: 0"
"--B-first: 0"
"--B-first: 1"
"--B-first: 2"
"Final A: 0"
*/

Continue outerloop

var a = 0;

outerloop: 
while(a < 5) {
  console.log('A-first: ' + a);
  for(var b = 0; b < 3; b++) {
    console.log('--B-first: ' + b);
    if(b === 2) {
     continue outerloop;
     console.log('--B-last: '+ b);
    }
  }
  console.log('A-last: ' + a);
  a++;
}
console.log('Final A: ' + a);

// Infinite loop

LABELED BLOCK WITH BREAK

// If statement

foo: if(true) {
  console.log('first');
  break foo;
  console.log('middle');
}
console.log('last');

/*
"first"
"last"
*/

// Object

mylabel:  {
  console.log('first');
  break mylabel;
  console.log('middle');
}
console.log('last');

/*
"first"
"last"
*/

LABEL IN NON-STRICT MODE FOR FUNCTIONS

Function declaration

label1: function myfunction() {}

Function generators

label1: function* myfunction() {}

Error when it is set in strict mode

'use strict';

label1: function myfunction(){}

// SyntaxError

Here is the gist compilation of codes

• Gist 1
• Gist 2
• Gist 3