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manavm1990/index.js

Created February 22, 2020 13:39
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Given an Array of Objects, determine how many of the Objects contain a specified key
Raw
index.js
const countKeys = (data, key) => {
return data.reduce((total, datum) => (total += datum[key] ? 1 : 0), 0);
};
@manavm1990
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This is probably not that useful outside of another example of reduce. After all, we might as well just use a map to actually get the values of that key ☝️ ...not just count it up.

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