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Why new Array(4).join(“ha”) yields “hahahaha” and not “undefinedhaundefinedha ..”


How do I check if an array includes an object in JavaScript?How to append something to an array?How do you access the matched groups in a JavaScript regular expression?Why is using “for…in” with array iteration a bad idea?Why does Google prepend while(1); to their JSON responses?Loop through an array in JavaScriptHow to check if an object is an array?Open a URL in a new tab (and not a new window) using JavaScriptHow do I remove a particular element from an array in JavaScript?For-each over an array in JavaScript?






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5















Why new Array(4).join("ha") yields "hahaha" and not "undefinedhaundefinedha .." ?



var arr = new Array(4);
alert( arr[0] ); // produces `undefined`









share|improve this question
































    5















    Why new Array(4).join("ha") yields "hahaha" and not "undefinedhaundefinedha .." ?



    var arr = new Array(4);
    alert( arr[0] ); // produces `undefined`









    share|improve this question




























      5












      5








      5








      Why new Array(4).join("ha") yields "hahaha" and not "undefinedhaundefinedha .." ?



      var arr = new Array(4);
      alert( arr[0] ); // produces `undefined`









      share|improve this question
















      Why new Array(4).join("ha") yields "hahaha" and not "undefinedhaundefinedha .." ?



      var arr = new Array(4);
      alert( arr[0] ); // produces `undefined`






      javascript






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Mar 28 at 19:41









      manonthemat

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      3,41312 silver badges33 bronze badges










      asked Mar 28 at 19:30









      user10777718user10777718

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          1 Answer
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          Elements of the array that are undefined or null are converted to the empty string. It's right there in the documentation.




          If an element is undefined or null, it is converted to the empty string.







          share|improve this answer



























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            Elements of the array that are undefined or null are converted to the empty string. It's right there in the documentation.




            If an element is undefined or null, it is converted to the empty string.







            share|improve this answer





























              5
















              Elements of the array that are undefined or null are converted to the empty string. It's right there in the documentation.




              If an element is undefined or null, it is converted to the empty string.







              share|improve this answer



























                5














                5










                5









                Elements of the array that are undefined or null are converted to the empty string. It's right there in the documentation.




                If an element is undefined or null, it is converted to the empty string.







                share|improve this answer













                Elements of the array that are undefined or null are converted to the empty string. It's right there in the documentation.




                If an element is undefined or null, it is converted to the empty string.








                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Mar 28 at 19:32









                PointyPointy

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