After trying out various techniques for creating JavaScript arrays, I came across an unexpected outcome. By utilizing map to push an array of self-references (DEMO):
a=[1,1,1,1,1,1,1,1,1,1];
a=a.map(a.push,a);
I ended up with the following result (when using Chrome):
[13,16,19,22,25,28,31,34,37,40]
Could someone provide an explanation for this behavior?
When iterating through each element in the array a, the function push is invoked with that specific element, its index, and the entire array being traversed. This results in an increase of three elements for every element in the original array. The total length of the array grows by three after each iteration, leading to a final array that contains the lengths of the a array after all the push callbacks have been executed.
To understand this process better, refer to the documentation on map and push.
There seems to be a connection with the return value of the push function being the new length, but it's unclear why it is increasing by 3.
Visit this link for more information on the push method in JavaScript arrays.
Returns
The new length property of the object that was called upon the method.
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