What methods do current web browsers utilize to implement the JS Array, particularly when it comes to adding

Question

What methods do current web browsers utilize to implement the JS Array, particularly when it comes to adding

When using the .push() method on an Array object in JavaScript, the underlying "array" capacity increases as more elements are added. If anyone knows of a reliable resource for this type of information regarding JavaScript, please feel free to share.

update

It appears that the JS Array functions similarly to an object literal with unique characteristics. I am particularly curious about the intricacies at a deeper level - specifically, how various browsers execute this functionality within their respective JS engines.

javascript arrays

Answer 1

Answer №1

There is no definitive right answer to this particular question. The way an array expands is a detail that differs between JavaScript implementations. Interestingly, the Tamarin engine employs two distinct internal mechanisms for arrays depending on whether it identifies the array as sequential or sparse.

Answer 2

There is no definitive right answer to this particular question. The way an array expands is a detail that differs between JavaScript implementations. Interestingly, the Tamarin engine employs two distinct internal mechanisms for arrays depending on whether it identifies the array as sequential or sparse.

Answer 3

Answer №2

Unfortunately, this response is incorrect. To find the accurate information, please refer to @Samuel Neff's answer and explore the resources provided below:

http://jsperf.com/array-popuplation-direction

It's worth noting that in JavaScript, arrays do not have a fixed capacity because they are not true arrays. They essentially function as object hashes with properties like "0", "1", "2", and so on, along with a length property. When you use the .push() method on an array, it is essentially translated to:

ary[ ary.length++ ] = the_new_element; // set via hash

Answer 4

Unfortunately, this response is incorrect. To find the accurate information, please refer to @Samuel Neff's answer and explore the resources provided below:

http://jsperf.com/array-popuplation-direction

It's worth noting that in JavaScript, arrays do not have a fixed capacity because they are not true arrays. They essentially function as object hashes with properties like "0", "1", "2", and so on, along with a length property. When you use the .push() method on an array, it is essentially translated to:

ary[ ary.length++ ] = the_new_element; // set via hash

Answer 5

Answer №3

When using Javascript, you have the option to specify the length of an array like this:

let numbers = new Array(5);
console.log(numbers.length); // outputs 5

However, it is important to note that JavaScript arrays are dynamic in nature, so there is typically no need to manually set the size of an array. In the example provided above, the array is not fixed-length; instead, it simply initializes with five undefined elements.

// Note: I may have misunderstood your question or if it has been revised, I apologize for any confusion.

Answer 6

When using Javascript, you have the option to specify the length of an array like this:

let numbers = new Array(5);
console.log(numbers.length); // outputs 5

However, it is important to note that JavaScript arrays are dynamic in nature, so there is typically no need to manually set the size of an array. In the example provided above, the array is not fixed-length; instead, it simply initializes with five undefined elements.

// Note: I may have misunderstood your question or if it has been revised, I apologize for any confusion.

What methods do current web browsers utilize to implement the JS Array, particularly when it comes to adding

Answer №1

Answer №2

Answer №3

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