What is the best way to transform a string array into a number array?

I'm attempting to convert a string array into a number array and after conducting some research online, I came across this solution:

    let numbersAsStringArray = originalQueryParams[property] ?? []
    let numbers = numbersAsStringArray.map((i) => Number(i));

However, I keep encountering the following error message referencing 'i':

Property 'map' does not exist on type 'string | string[]'.

The numbersAsStringArray is just a simple array containing numbers as strings.

Answer №1

This error occurs during compilation, not at runtime. Simply declare to TypeScript that numberAsStringArray is of type string[] and the issue will be resolved.

let numbersAsStringArray = (originalQueryParams[property] || []) as string[];
let numbers = numbersAsStringArray.map((i) => Number(i));

Answer №2

To convert an array of numbers in string format to an array of actual numbers, you could attempt using the code

let numArray = Array.from(numbersAsStringArray, Number)

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