Strange syntax of Number methods in JavaScript -

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निम्न कोड पर एक नज़र डालें: 

  number.prototype.isIn = function ) {For (var i = 0, j = arguments.length; i & lt; j; ++ i) {if (parseInt (यह, 10) === तर्क [i]) {वापस सत्य; }     }     विवरण झूठा है; }; Var x = 2; console.log (x.isIn (1,2,3,4,5)); // & lt; = 'true' console.log (2.isIn (1,2,3,4,5)); / <>

ऐसा क्यों है कि जब यह एक चर है, तो कोड सही तरीके से अभी तक काम करता है, जब यह एक संख्या का शाब्दिक होता है, तो यह विफल हो जाता है?

console.log ((2) .isIn (1,2,3,4, 5)); // & lt; = 'true'

उपरोक्त पंक्ति में, मैं मूल रूप से कोष्ठक में शाब्दिक रूप से संलग्न करता हूं।

यह एक वाक्य रचना त्रुटि है क्योंकि आप किसी संख्या का प्रतिनिधित्व कर रहे हैं। तार इस तरह से काम कर सकते हैं, लेकिन संख्या नहीं, क्योंकि किसी संख्या के तुरंत बाद की अवधि दशमलव मान का प्रतीक है। । के बाद का चरित्र त्रुटि पैदा कर रहा है।


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