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This article introduces the knowledge of "what is the largest array of JavaScript". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

JavaScript arrays can have a maximum length of "2 to the 32th power-1"; according to the ECMA-262 5th edition specification, the maximum length of the array is bound by an unsigned 32-bit integer, so the longest array can have "2 to the 32th power-1", that is, 4294967295 elements.

The operating environment of this tutorial: windows10 system, javascript1.8.5 version, Dell G3 computer.

What is the maximum size of an array of JavaScript

The maximum length of array is Math.pow (2mem32)-1 to the power of 32.

Manual testing, a simple loop is certainly not realistic, decided to directly define the length of the length of the array to test.

Obviously, this array does not exceed the maximum length, so length outputs normally.

And when we change this value to Math.pow (2.32)

The output is invalid array length, so it can be seen that the maximum length of js array is indeed 2 to the power of 32-1.

According to the ECMA-262 version 5 specification, the maximum length of an array is bound by an unsigned 32-bit integer because of ToUint 32 abstract operations, so the longest array can have 2. 32-1 # 4 294 967 295 = 4.29 billion elements.

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