What is the best way to define a TypeScript type that represents an array of objects containing properties with values of either numbers or strings?

Within my component, I've defined an input like this:

@Input() rows: (string | number)[][];

These 'strintegers' represent a two-dimensional matrix in my data, with a mixture of strings and numbers. Since each row may have a different number of elements, I decided to convert the matrix into a dictionary format - an array of objects where each object contains only 'strintegers'. Here's what I came up with:

@Input() rows: { [key: string]: (string | number) }[];

Although my code seems to be working fine, I'm concerned about its syntax correctness and readability. I worry that there might be a better way to define this type of data structure. Can anyone suggest a more elegant approach?

typescript

Answer №1

This TypeScript code appears to be well-written and valid. If it were me, I would recommend organizing the typings by creating an interface that could be easily reused in various components - whether it's within the parent component providing the input data or passed down to child components.

export interface Row {
  [key: string]: string | number;
}

Within the component itself, you can then import this interface and utilize it for declaring the input types.

@Input() rows: Row[];

An alternative approach, as mentioned by @aleksayl., is to incorporate a default TypeScript generic type like below.

Record<string, string | number>[]

Answer №2

No need to fret, your code is in great shape as it is. But, consider enhancing it by encapsulating your model within an interface, like so:

interface Data {
  [prop: string]: string | number;
}

Just a quick note: even if your syntax is accepted by the compiler/transpiler, there may still be room for improvement.

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