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Type Conversion एक mechanism / process है जिसमे हम किसी दी गयी value को दुसरे type में convert करते हैं। इसे Type Casting भी कहते हैं।
हम जानते हैं कि JavaScript dynamic type language है means किसी variable को initialize करते समय हमें इसमें assign की गयी value के type को declare नहीं करना पड़ता है , जिस भी तरह की हम value assign करते है JavaScript Engine इसे automatically convert कर देता है।
किसी दिए गए number या boolean value , string में convert करने के लिए String() function का use करते हैं।
Another File : string_conversion.html
<!DOCTYPE html >
<html>
<head>
<meta charset="utf-8">
<title>Js String Type Conversion</title>
</head>
<body>
<script>
let x = 12; /* number to string*/
document.write('Now type of x : '+ typeof String(x));
let y = true; /* boolean to string*/
document.write('<br>Now type of y : '+ typeof String(y));
let z = null; /* null to string*/
document.write('<br>Now type of z : '+ typeof String(z));
</script>
</body>
</html>JavaScript में Number type conversion के लिए Number() function का use करते हैं।
Another File : string_conversion.html
<!DOCTYPE html >
<html>
<head>
<meta charset="utf-8">
<title>Js Number Type Conversion</title>
</head>
<body>
<script>
let x = '12'; /*single quoted string to number*/
document.write('Now type of x : '+ typeof Number(x));
let y = "10"; /*double quoted string to number*/
document.write('<br>Now type of y : '+ typeof Number(y));
let z = null; /*null to Number*/
document.write('<br>Now type of z : '+ typeof Number(z));
</script>
</body>
</html>
किसी दी गई number या string value , boolean में number करने के लिए Boolean() function का use करते हैं।
हालाँकि JavaScript में empty string , 0 , false , null , undefined, empty array हमेशा false ही होते हैं , इसके अलावा string (except empty string) , object , array (that have some value), defined variable (जिसकी value empty string , 0 , false , null नहीं है) हमेशा true होते हैं।
Another File : bool_conversion.html
<!DOCTYPE html >
<html>
<head>
<meta charset="utf-8">
<title>Js Boolean Type Conversion</title>
</head>
<body>
<script>
document.write('type of "true" : '+ Boolean("True"));
document.write('<br>string converts into true : '+Boolean('mystring'));
document.write('<br>string that contain 0 converts into true : '+Boolean('0'));
document.write('<br>empty string converts into false: '+Boolean(''));
document.write('<br>null converts into false : '+Boolean(null));
document.write('<br>numeric value 0 converts into false : '+Boolean(0));
let x;
document.write('<br>undefined variable converts into false : '+Boolean(x));
</script>
</body>
</html>
Hi ! I'm Rahul Kumar Rajput founder of learnhindituts.com. I'm a software developer having more than 4 years of experience. I love to talk about programming as well as writing technical tutorials and blogs that can help to others. I'm here to help you navigate the coding cosmos and turn your ideas into reality, keep coding, keep learning :)
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