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export function randString(
len: number = 32,
chars: string = 'abcdefghijklmnopqrstuvwxyz',
): string {
let str = ''
for (let i = 0; i < len; i++) {
str += chars[Math.floor(Math.random() * chars.length)]
}
return str
}
export function randEmail(): string {
return `${randString(16)}@${randString(12)}.com`
}
export function randInt(min: number, max: number): number {
return Math.floor(Math.random() * (max - min + 1) + min)
}
export function randBool(): boolean {
return Math.random() < 0.5
}
export function randDate(): Date {
return new Date(randInt(0, Date.now()))
}
export function randTime(): string {
return `${randInt(0, 23).toString().padStart(2, '0')}:${randInt(0, 59).toString().padStart(2, '0')}`
}
const timeZones = [
'Etc/UTC',
'America/Los_Angeles',
'America/New_York',
'America/Chicago',
'Europe/London',
'Asia/Tokyo',
'Australia/Sydney',
]
export function randPickOne<T>(arr: T[]): T {
return arr[Math.floor(Math.random() * arr.length)]
}
export function randTimeZone(): string {
return randPickOne(timeZones)
}
/* randSample returns a random sample of items from the input array (duplicates possible). */
export function randSample<T>(
items: T[],
max: number = items.length,
min: number = 0,
): T[] {
const n = randInt(min, max)
const result = []
for (let i = 0; i < n; i++) {
result.push(randPickOne(items))
}
return result
}
/* randSampleUnique returns a random sample of unique items from the input array. */
export function randSampleUnique<T>(
items: T[],
min: number = 0,
max: number = items.length,
): T[] {
if (max > items.length) {
max = items.length
}
const n = randInt(min, max)
const result: T[] = []
for (let i = 0; i < n; i++) {
const item = randPickOne(items)
if (!result.includes(item)) {
result.push(item)
}
}
return result
}
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