Lint error: Expression detected when an assignment or function call was expected according to @typescript-eslint/no-unused-expressions rule

Encountering an error message while utilizing the code snippet 

countryMap.get(tradeId)?.map((companies) => {
: The error states 'Expected an assignment or function call and instead saw an expression @typescript-eslint/no-unused-expressions'

const calculate = (countryId: string) => {
    let rev = 0;
    countryMap.get(countryId)?.map((companies) => {
        rev += Number(companies.profitAndLoss);
        rev = Number(rev.toFixed(2));
    })
    return rev;
}

Looking for assistance to comprehend the source of this issue and ways to resolve it. Any insights are greatly appreciated!

typescriptreact-nativeeslint

Answer №1

It seems that using reduce in this case could be beneficial. Additionally, the variable countryId is not being utilized which may be causing an error. Furthermore, the origin of tradeId is unclear.

const calculate = (countryId: string) => {
    return  countryMap.get(countryId)?.reduce((rev, companies) => {
        profit = Number(companies.profitAndLoss);
        return  Number((rev + profit).toFixed(2));
    })
}

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