Seamless string arrays in JavaScript and TypeScript

I am working with a system that has the following structure:

    interface Data {
        x: number;
        y: number;
        n: string;
    }

    const array = Array<Data>(100);

I have heard that in Chrome, the V8 engine may allocate objects as C arrays if the array contains only the same type of data. Is there a way to check if my 'array' object will function as a C array or dictionary? In other words, how can I determine if the memory is contiguous?

If such a check is not feasible, I know that I could utilize a SoA model using TypedArrays like so:

    interface Data {
        x: Float64Array;
        y: Float64Array;
        n: ????;
    }

    const dataArray = {
        x: new Float64Array(100),
        y: new Float64Array(100),
        n: ????????
    } as Data

However, I am unsure about how to store Strings in an array structured in this manner.

Answer №1

As a developer who specializes in V8, I want to clarify that using var dataArray = new Array(100) will create a contiguous array of 100 pointers, resembling C-like behavior rather than a dictionary. When you use dataArray[0] = new Data(x, y, n), it will allocate a new Data object outside of the array and store a pointer to it in the first slot of the array. Within this Data object, V8 can directly store numbers on 64-bit platforms like x and y, while strings and other objects will be stored as pointers to separate objects. If your array only contains numbers, V8 can also store them directly in the array without requiring a Float64Array.

Although there may be minor performance differences, they are likely insignificant. Therefore, my recommendation is to focus on writing code that is most readable and aligns with your algorithm/data model.

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