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Prefer arrow functions and callbacks (#1210)

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This commit is contained in:
Lipis
2020-05-20 16:21:37 +03:00
committed by GitHub
parent 33fe223b5d
commit c427aa3cce
64 changed files with 784 additions and 847 deletions
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14
src/gesture.ts
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@@ -1,18 +1,16 @@
import { PointerCoords } from "./types";
import { normalizeScroll } from "./scene";
export function getCenter(pointers: Map<number, PointerCoords>) {
export const getCenter = (pointers: Map<number, PointerCoords>) => {
const allCoords = Array.from(pointers.values());
return {
x: normalizeScroll(sum(allCoords, (coords) => coords.x) / allCoords.length),
y: normalizeScroll(sum(allCoords, (coords) => coords.y) / allCoords.length),
};
}
};
export function getDistance([a, b]: readonly PointerCoords[]) {
return Math.hypot(a.x - b.x, a.y - b.y);
}
export const getDistance = ([a, b]: readonly PointerCoords[]) =>
Math.hypot(a.x - b.x, a.y - b.y);
function sum<T>(array: readonly T[], mapper: (item: T) => number): number {
return array.reduce((acc, item) => acc + mapper(item), 0);
}
const sum = <T>(array: readonly T[], mapper: (item: T) => number): number =>
array.reduce((acc, item) => acc + mapper(item), 0);