bc518174
 王天杨
提交两个项目文件
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// cheap lodash replacements
export function memoize<T>(fn: () => T): () => T {
let result: T | null = null
const memoized = () => {
if (result == null) {
result = fn()
}
return result
}
return memoized
}
/**
* drop-in replacement for _.without
*/
export function without<T>(items: T[], item: T) {
return items.filter((i) => i !== item)
}
export function union<T extends string | number>(itemsA: T[], itemsB: T[]) {
const set = new Set<T>()
const insertItem = (item: T) => set.add(item)
itemsA.forEach(insertItem)
itemsB.forEach(insertItem)
const result: T[] = []
set.forEach((key) => result.push(key))
return result
}
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