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forϧʔϓΛ͑ͯ
ลढ़ี ˏcraftgear
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ߴ֊ؔͬͯ
͝ଘͰ͔͢ʁ
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ߴ֊ؔͱ
ͨͱ͑ɺ
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ؔΛҾʹऔΔ
ؔ
$('#button').click(
e => {
console.log(e);
}
);
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ؔΛΓͱ͠
ͯฦؔ͢
const createCounter = () => {
var number = 0;
return () => {
number++;
return number;
};
}
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Array.map(fn)
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forϧʔϓͰͳ
ͯ͘mapϝιο
υΛ͏ཧ༝
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ίʔυ
ͷ
ҙਤ
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const a
=
[1,2,3].map(fn)
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Γaͷܕ
ྻͰɺ
ཁૉ̏
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ྻͷ֤ཁૉ
ʹରͯ͠fnΛ
࣮ߦ͍ͯ͠Δ
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ԿΛΓ͍ͨ
͔fnͷதΛ
ಡΊΘ͔Δ
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Θ͔Γ͍͢
ί
ʔ
υ
ɺॏཁɻ
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ϝϯς͕༰қ
ฏͳίʔυ
ϨϏϡʔ
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fnΛΓग़
ͯ͠ςετ
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࣭
্
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UIߏங
ʹศར
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const dummyTodos = [
{ id: 1, title: 'aaaa', done: true },
{ id: 2, title: 'aaaa', done: false },
];
const TodoList = ({ todos }) => (
{todos.map(todo => (
))}
);
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map͚ͩ
͡Όͳ͍
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map(f) filter(f) reduce(f, init) forEach(f)
ྻ [n] [n] [n] [n]
Γ [n] [<= n] initͱಉܕ ͳ͠
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some(f) every(f) findIndex(f) find(f)
ྻ [n] [n] [n] [n]
Γ ਅِ ਅِ ཁૉҰͭ
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༻্ͷҙ
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filterʹ͢fn͕ฦ͢
ਅِͰ͋Δ͜ͱ
-1falseʹͳΒͳ͍
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[].some [].every
ৗʹtrue
ʮۭڏʹਅʯ
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ඇಉظॲཧ
Promise.all()Ͱ
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reduce
΄Ͳ΄Ͳʹ
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chainingͱ
compositionͰ
֦͕Δੈք
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const double = v => v * 2
const over5 = v => v > 5
const a = [1,2,3]
.map(double)
.filter(over5)
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import * as R
from 'ramda';
const doubleOver5
= R.compose(
R.filter(over5),
R.map(double)
);
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const b
= doubleOver5([2, 3, 4]);
const c
= doubleOver5(
{a: 1, b: 2, c: 3}
);
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࣮ԋ
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Thank You!