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indongyoo/fnes_3_map_4.js

Last active April 3, 2018 12:15
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fnes_3_map_4.js
// Iterator 2
console.log(
map(
([key, val]) => [key.toUpperCase(), val + 1],
new Map([['a', 1], ['b', 2]]).entries())
);
// [["A", 2], ["B", 3]]
console.log(
new Map(map(
([key, val]) => [key.toUpperCase(), val + 1],
new Map([['c', 3], ['d', 4]]).entries()))
);
// Map(2) {"C" => 4, "D" => 5}
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