Solution Review: Calculate Score
This lesson will explain the solution to the problem in the previous lesson.
Solution #
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function boySum(records){const ans = records.filter(({gender}) => gender === 'BOYS')var out = ans.reduce((sum, records) => sum +records.value,0)return out}const records = [{value: 55,gender: "BOYS"},{value: 10,gender: "BOYS"},{value: 85,gender: "GIRLS"},{value: 12,gender: "GIRLS"},{value: 70,gender: "BOYS"}]console.log(boySum(records))
Explanation #
To solve this challenge, we make use of two higher-order functions, filter
and reduce
. Before we discuss the code, let’s understand these functions.
filter
: takes a callback function as a parameter and returns a new ...
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