Created
November 7, 2020 16:06
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const counties = [ | |
{ name: 'Clackamas', state: 'Oregon', population: 380000 }, | |
{ name: 'King', state: 'Washington', population: 2000000 }, | |
{ name: 'Kitsap', state: 'Washington', population: 250000 }, | |
{ name: 'Multinomah', state: 'Oregon', population: 750000 }, | |
{ name: 'Snohomish', state: 'Washington', population: 720000 }, | |
{ name: 'Wasco', state: 'Oregon', population: 25000 }, | |
]; | |
const highPopulousCounties = counties.reduce((acc, { name, state, population }) => { | |
// This filters out anything smaller than 700000 | |
if (population <= 700000) return acc; | |
// Again using a spread here. If the array is already started, | |
// it will fill, otherwise it'll initialize a new array. | |
const updatedAcc = [...acc]; | |
updatedAcc.push({ fullName: `${name} County, ${state}`, population }); | |
return updatedAcc; | |
}, []); | |
// Returns: | |
// [ | |
// { fullName: 'King County, Washington', population: 2000000 }, | |
// { fullName: 'Multinomah County, Oregon', population: 750000 }, | |
// { fullName: 'Snohomish County, Oregon', population: 720000 }, | |
// ] |
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