"Utilizing Typed Arrays for Efficient Data Handling in JavaScript

Question

"Utilizing Typed Arrays for Efficient Data Handling in JavaScript

How can I ensure my Javascript array is of a specific type?

For instance, when creating a class like the one below:

export default class AnalyticData {
    constructor(collection = []) {
        return collection.map((item) => new AnalyticDatum(item))
    }
}

After instantiating myData = new AnalyticData(), the type of myData ends up being Array instead of AnalyticData.

Is there a way to guarantee that my data is of type AnalyticData rather than an Array?

I am facing this issue in my Vue component, where I have defined the following:

props: {
    analyticData: {
        type: AnalyticData,
        required: true,
    },
},

This results in the warning message:

[Vue warn]: Invalid prop: type check failed for prop "analyticData". Expected AnalyticData, got Array

Does anyone have a solution to create a typed Array in JavaScript?

javascript arrays vue.js class object

Answer 1

Answer №1

Not sure if the term AnalyticDatum is a mistake, but you have the option to create custom types by utilizing extends.

export default class AnalyticData extends Array {
  constructor(collection = []) {
    super().push(...collection);
  }
};

If AnalyticDatum refers to another class used to define items within AnalyticData, you can still employ the map(...) function:

export default class AnalyticData extends Array {
  constructor(collection = []) {
    super().push(...collection.map(item => new AnalyticDatum(item)));
  }
};

In both scenarios, any instance of new AnalyticData will represent an object of type AnalyticData. This should not pose compatibility issues with your existing type checker.

Answer 2

Not sure if the term AnalyticDatum is a mistake, but you have the option to create custom types by utilizing extends.

export default class AnalyticData extends Array {
  constructor(collection = []) {
    super().push(...collection);
  }
};

If AnalyticDatum refers to another class used to define items within AnalyticData, you can still employ the map(...) function:

export default class AnalyticData extends Array {
  constructor(collection = []) {
    super().push(...collection.map(item => new AnalyticDatum(item)));
  }
};

In both scenarios, any instance of new AnalyticData will represent an object of type AnalyticData. This should not pose compatibility issues with your existing type checker.

Answer 3

Answer №2

In JavaScript, creating number arrays is straightforward, but dealing with object arrays can be more complex, especially when handling dynamic data like strings which require space allocation. This low-level process may not be ideal for most JavaScript projects.

If feasible for your project, I recommend using TypeScript for easier typed programming:

interface AnalyticDatum {
  date: Date;
  info: string;
}

const data: AnalyticDatum[] = [{
    date: new Date("2019-07-27"),
    info: 'Some text',
},{
    date: new Date("2019-09-24"),
    info: 'Some other text',
}];

data.push({
    date: new Date("2019-12-27"),
    info: 'New entry',
});

console.log(data);

Test this code snippet here

Answer 4

In JavaScript, creating number arrays is straightforward, but dealing with object arrays can be more complex, especially when handling dynamic data like strings which require space allocation. This low-level process may not be ideal for most JavaScript projects.

If feasible for your project, I recommend using TypeScript for easier typed programming:

interface AnalyticDatum {
  date: Date;
  info: string;
}

const data: AnalyticDatum[] = [{
    date: new Date("2019-07-27"),
    info: 'Some text',
},{
    date: new Date("2019-09-24"),
    info: 'Some other text',
}];

data.push({
    date: new Date("2019-12-27"),
    info: 'New entry',
});

console.log(data);

Test this code snippet here

"Utilizing Typed Arrays for Efficient Data Handling in JavaScript

Answer №1

Answer №2

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