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break का use current loop (for Loop , for in Loop , for of Loop , while Loop , do while Loop या switch loop ) execution को terminate करता है।
break [label];
break भी continue statement की तरह एक Optional parameter accept करता है , जो current या parent loop को identify करता है जिसका current execution terminate करना हो।
File : for_break.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript break Statement </title>
</head>
<body>
<script>
let x;
for(x=1; x <= 5 ; x++)
{
if(x==3)
{
break;
}
document.write(`${x} <br>`);
}
</script>
</body>
</html>Example में आप देख सकते हैं कि x की value 3 होते ही loop terminate हो गया।
break statement हमेशा referenced label के अंदर ही होना चाहिए।
File : break2.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript break with labeled Statement </title>
</head>
<body>
<script>
let x;
outer_loop : for(x=1; x <= 5 ; x++)
{
let y;
inner_loop :for(y=1; y <= x; y++)
{
if(x == 3)
break outer_loop;
document.write(`Inner Loop Value : ${y} <br>`);
}
document.write(`Outer Loop Value : ${x} <br>`);
}
</script>
</body>
</html>Example में आप देख सकते हैं की break के बाद label , parent loop को identify कर रहा है।
label का नाम किसी दूसरे independent loop को identify कर रहे label नहीं दे सकते हैं।नीचे कुछ valid या invalid syntax दिए गए हैं।
/* It will work*/
outer_block: {
inner_block: {
document.write('inner block');
break outer_block; /* breaks out of both inner_block and outer_block */
document.write('inner block 2'); /* skip */
}
document.write('outer block'); /* skip */
}
/*It generates error : Uncaught SyntaxError: label not found */
label1 : {
document.write('label 1');
break label2;
}
label2 :{
document.write('label 2');
}
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