In my JavaScript code, I declared the myArr variable in the following way:
var myArr= Array(3);
Upon logging the value of myArr, I received the output:
[undefined × 3]
Next, I utilized the JavaScript join function with the code snippet:
myArr.join('X');
After logging the result of this operation, I obtained:
"XX"
I am puzzled by this outcome. I initially anticipated the result to be:
"undefinedXundefinedX"
The Array.prototype.join method converts all elements in an array into strings and concatenates them together to form a single string. If an element is undefined or null, it will be converted to an empty string. Learn more about join
When using join on an array with undefined elements, they are treated as empty strings and concatenated with the specified separator, in this case 'X': ["", "", ""].join('X')
Array(3) generates an array containing three undefined values.
In order to obtain the desired outcome, you must populate these undefined values: Array(3).fill()
Array(3) creates an array with a length of 3.
When logging myArr, it will display an empty array.
Join combines all elements of the array into a string.
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