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Merge pull request #29 from PAIR-code/all-items
All items added, with their images, seed the database with 5 random pairs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -13,4 +13,4 @@ | |
| "devDependencies": { | ||
| "@types/node": "^20.12.7" | ||
| } | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| /** Random utilities that support seeding. */ | ||
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| // ********************************************************************************************* // | ||
| // SEED // | ||
| // ********************************************************************************************* // | ||
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| // Seed shared by all random functions. | ||
| let RANDOM_SEED = 0; | ||
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| /** Initialize the seed with a custom value */ | ||
| export const seed = (value: number) => { | ||
| RANDOM_SEED = value; | ||
| }; | ||
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| /** Update the seed using a Linear Congruential Generator */ | ||
| const next = (a = 1664525, b = 1013904223, m = 2 ** 32) => { | ||
| RANDOM_SEED = (a * RANDOM_SEED + b) % m; | ||
| return RANDOM_SEED; | ||
| }; | ||
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| // ********************************************************************************************* // | ||
| // RANDOM FUNCTIONS // | ||
| // ********************************************************************************************* // | ||
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| /** Returns a random floating point value in [0, 1] */ | ||
| export const random = () => next() / 2 ** 32; | ||
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| /** Returns a random integer in [min, max] */ | ||
| export const randint = (min: number, max: number) => Math.floor(random() * (max - min + 1)) + min; | ||
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| /** Chooses a random value from an array. The array is not modified. */ | ||
| export const choice = <T>(array: readonly T[]): T => { | ||
| if (array.length === 0) { | ||
| throw new Error('Cannot choose from an empty array'); | ||
| } | ||
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| return array[randint(0, array.length - 1)]; | ||
| }; | ||
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| /** Chooses n random distinct values from an array. The array is not modified. */ | ||
| export const choices = <T>(array: readonly T[], n: number): T[] => { | ||
| if (array.length <= n) { | ||
| throw new Error(`Cannot choose ${n} distinct values from an array of length ${array.length}`); | ||
| } | ||
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| const copy = [...array]; | ||
| const result: T[] = []; | ||
| for (let i = 0; i < n; i++) { | ||
| const index = randint(0, copy.length - 1); | ||
| result.push(copy[index]); | ||
| copy.splice(index, 1); | ||
| } | ||
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| return result; | ||
| }; |
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