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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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Why new Array(4).join("ha") yields "hahaha" and not "undefinedhaundefinedha .." ?
var arr = new Array(4);
alert( arr[0] ); // produces `undefined`
javascript
edited Mar 28 at 19:41
manonthemat
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asked Mar 28 at 19:30
user10777718user10777718
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Why new Array(4).join("ha") yields "hahaha" and not "undefinedhaundefinedha .." ?
var arr = new Array(4);
alert( arr[0] ); // produces `undefined`
javascript
edited Mar 28 at 19:41
manonthemat
3,41312 silver badges33 bronze badges
asked Mar 28 at 19:30
user10777718user10777718
4051 silver badge10 bronze badges
add a comment
|
Why new Array(4).join("ha") yields "hahaha" and not "undefinedhaundefinedha .." ?
var arr = new Array(4);
alert( arr[0] ); // produces `undefined`
javascript
edited Mar 28 at 19:41
manonthemat
3,41312 silver badges33 bronze badges
asked Mar 28 at 19:30
user10777718user10777718
4051 silver badge10 bronze badges
Why new Array(4).join("ha") yields "hahaha" and not "undefinedhaundefinedha .." ?
var arr = new Array(4);
alert( arr[0] ); // produces `undefined`
javascript
javascript
edited Mar 28 at 19:41
manonthemat
3,41312 silver badges33 bronze badges
asked Mar 28 at 19:30
user10777718user10777718
4051 silver badge10 bronze badges
edited Mar 28 at 19:41
manonthemat
3,41312 silver badges33 bronze badges
asked Mar 28 at 19:30
user10777718user10777718
4051 silver badge10 bronze badges
edited Mar 28 at 19:41
manonthemat
3,41312 silver badges33 bronze badges
edited Mar 28 at 19:41
manonthemat
3,41312 silver badges33 bronze badges
edited Mar 28 at 19:41
manonthemat
3,41312 silver badges33 bronze badges
3,41312 silver badges33 bronze badges
asked Mar 28 at 19:30
user10777718user10777718
4051 silver badge10 bronze badges
asked Mar 28 at 19:30
user10777718user10777718
4051 silver badge10 bronze badges
asked Mar 28 at 19:30
user10777718user10777718
4051 silver badge10 bronze badges
4051 silver badge10 bronze badges
add a comment
|
add a comment
|
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.
answered Mar 28 at 19:32
PointyPointy
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1 Answer
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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.
answered Mar 28 at 19:32
PointyPointy
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add a comment
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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.
answered Mar 28 at 19:32
PointyPointy
332k47 gold badges477 silver badges544 bronze badges
add a comment
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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.
answered Mar 28 at 19:32
PointyPointy
332k47 gold badges477 silver badges544 bronze badges
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.
answered Mar 28 at 19:32
PointyPointy
332k47 gold badges477 silver badges544 bronze badges
answered Mar 28 at 19:32
PointyPointy
332k47 gold badges477 silver badges544 bronze badges
answered Mar 28 at 19:32
PointyPointy
332k47 gold badges477 silver badges544 bronze badges
answered Mar 28 at 19:32
PointyPointy
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