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zwacky/comma-operator.js

Last active June 12, 2018 22:18
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comma-operator.js
// the 3 line reduce callback
[{key: 'USA', value: […]}, {key: 'Germany', value: […]}, {key: null, value: []}]
.filter(item => item.key)
.map(item => {
item.key = item.key.toUpperCase();
return item;
})
.reduce((accumulator, item) => {
accumulator[item.key] = item.value;
return accumulator;
}, {});
// could turn into
[{key: 'USA', value: […]}, {key: 'Germany', value: […]}, {key: null, value: []}]
.filter(item => item.key)
.map(item => (item.key = item.key.toLowerCase(), item))
.reduce((accumulator, item) => (accumulator[item.key] = item.value, accumulator), {});
// -> {USA: […], GERMANY: […]}
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