feat: add pick, omit, pickBy, and omitBy functions

docs/.vitepress/items/collection.ts

@@ -3,4 +3,8 @@ export const collectionItems = [
   { text: 'cloneDeepWith', link: '/collection/clone-deep-with' },
   { text: 'merge', link: '/collection/merge' },
   { text: 'mergeWith', link: '/collection/merge-with' },
+  { text: 'pick', link: '/collection/pick' },
+  { text: 'omit', link: '/collection/omit' },
+  { text: 'pickBy', link: '/collection/pick-by' },
+  { text: 'omitBy', link: '/collection/omit-by' },
 ]

docs/collection/omit-by.md

@@ -0,0 +1,25 @@
+# omitBy
+
+Creates a new object by omitting key-value pairs based on a predicate function.
+
+### Usage
+
+```ts
+import { omitBy } from 'rattail'
+
+const picked = omitBy({ a: 1, b: 2, c: 3 }, (value) => value > 1)
+console.log(picked) // { a: 1 }
+```
+
+### Arguments
+
+| Arg         | Type                                   | Defaults |
+| ----------- | -------------------------------------- | -------- |
+| `object`    | `object`                               |          |
+| `predicate` | `(value: any, key: string) => boolean` |          |
+
+### Return
+
+| Type     |
+| -------- |
+| `object` |

docs/collection/omit.md

@@ -0,0 +1,25 @@
+# omit
+
+Creates a new object by omitting specified keys from an existing object.
+
+### Usage
+
+```ts
+import { omit } from 'rattail'
+
+const omitted = omit({ a: 1, b: 2, c: 3 }, ['a', 'c'])
+console.log(omitted) // { b: 2 }
+```
+
+### Arguments
+
+| Arg      | Type       | Defaults |
+| -------- | ---------- | -------- |
+| `object` | `object`   |          |
+| `keys`   | `string[]` |          |
+
+### Return
+
+| Type     |
+| -------- |
+| `object` |

docs/collection/pick-by.md

@@ -0,0 +1,25 @@
+# pickBy
+
+Creates a new object by picking key-value pairs based on a predicate function.
+
+### Usage
+
+```ts
+import { pickBy } from 'rattail'
+
+const picked = pickBy({ a: 1, b: 2, c: 3 }, (value) => value > 1)
+console.log(picked) // { b: 2, c: 3 }
+```
+
+### Arguments
+
+| Arg         | Type                                   | Defaults |
+| ----------- | -------------------------------------- | -------- |
+| `object`    | `object`                               |          |
+| `predicate` | `(value: any, key: string) => boolean` |          |
+
+### Return
+
+| Type     |
+| -------- |
+| `object` |

docs/collection/pick.md

@@ -0,0 +1,25 @@
+# pick
+
+Creates a new object by selecting specified keys from an existing object.
+
+### Usage
+
+```ts
+import { pick } from 'rattail'
+
+const picked = pick({ a: 1, b: 2, c: 3 }, ['a', 'c'])
+console.log(picked) // { a: 1, c: 3 }
+```
+
+### Arguments
+
+| Arg      | Type       | Defaults |
+| -------- | ---------- | -------- |
+| `object` | `object`   |          |
+| `keys`   | `string[]` |          |
+
+### Return
+
+| Type     |
+| -------- |
+| `object` |

docs/zh/collection/omit-by.md

@@ -0,0 +1,25 @@
+# omitBy
+
+通过提供的谓词函数排除键值对来创建新对象。
+
+### 使用
+
+```ts
+import { omitBy } from 'rattail'
+
+const picked = omitBy({ a: 1, b: 2, c: 3 }, (value) => value > 1)
+console.log(picked) // { a: 1 }
+```
+
+### 参数
+
+| 参数        | 类型                                   | 默认值 |
+| ----------- | -------------------------------------- | ------ |
+| `object`    | `object`                               |        |
+| `predicate` | `(value: any, key: string) => boolean` |        |
+
+### 返回值
+
+| 类型     |
+| -------- |
+| `object` |

docs/zh/collection/omit.md

@@ -0,0 +1,25 @@
+# omit
+
+通过从现有对象中排除指定键来创建新对象。
+
+### 使用
+
+```ts
+import { omit } from 'rattail'
+
+const omitted = omit({ a: 1, b: 2, c: 3 }, ['a', 'c'])
+console.log(omitted) // { b: 2 }
+```
+
+### 参数
+
+| 参数     | 类型       | 默认值 |
+| -------- | ---------- | ------ |
+| `object` | `object`   |        |
+| `keys`   | `string[]` |        |
+
+### 返回值
+
+| 类型     |
+| -------- |
+| `object` |

docs/zh/collection/pick-by.md

@@ -0,0 +1,25 @@
+# pickBy
+
+通过提供的谓词函数选择键值对来创建新对象。
+
+### 使用
+
+```ts
+import { pickBy } from 'rattail'
+
+const picked = pickBy({ a: 1, b: 2, c: 3 }, (value) => value > 1)
+console.log(picked) // { b: 2, c: 3 }
+```
+
+### 参数
+
+| 参数        | 类型                                   | 默认值 |
+| ----------- | -------------------------------------- | ------ |
+| `object`    | `object`                               |        |
+| `predicate` | `(value: any, key: string) => boolean` |        |
+
+### 返回值
+
+| 类型     |
+| -------- |
+| `object` |

docs/zh/collection/pick.md

@@ -0,0 +1,25 @@
+# pick
+
+通过从现有对象中选择指定键来创建新对象。
+
+### 使用
+
+```ts
+import { pick } from 'rattail'
+
+const picked = pick({ a: 1, b: 2, c: 3 }, ['a', 'c'])
+console.log(picked) // { a: 1, c: 3 }
+```
+
+### 参数
+
+| 参数     | 类型       | 默认值 |
+| -------- | ---------- | ------ |
+| `object` | `object`   |        |
+| `keys`   | `string[]` |        |
+
+### 返回值
+
+| 类型     |
+| -------- |
+| `object` |

src/collection.ts

@@ -167,3 +167,52 @@ export function cloneDeepWith<T>(value: T, fn: (value: any) => any): T {
 
   return baseCloneDeep(value, cache)
 }
+
+export function pick<T, K extends keyof T>(object: T, keys: K[]) {
+  return keys.reduce(
+    (result, key) => {
+      result[key] = object[key]
+      return result
+    },
+    {} as Pick<T, K>,
+  )
+}
+
+export function omit<T extends object, K extends keyof T>(obj: T, keys: K[]): { [K2 in Exclude<keyof T, K>]: T[K2] } {
+  const keysToOmit = new Set(keys)
+  const result = {} as { [K in keyof T]: T[K] }
+
+  ;(Object.keys(obj) as (keyof T)[]).forEach((key) => {
+    if (!keysToOmit.has(key as K)) {
+      result[key] = obj[key]
+    }
+  })
+
+  return result
+}
+
+export function pickBy<T extends object>(
+  object: T,
+  predicate: (value: T[keyof T], key: keyof T) => boolean,
+): Partial<T> {
+  return Object.keys(object).reduce((result, key) => {
+    const typedKey = key as keyof T
+    if (predicate(object[typedKey], typedKey)) {
+      result[typedKey] = object[typedKey]
+    }
+    return result
+  }, {} as Partial<T>)
+}
+
+export function omitBy<T extends object>(
+  object: T,
+  predicate: (value: T[keyof T], key: keyof T) => boolean,
+): Partial<T> {
+  return Object.keys(object).reduce((result, key) => {
+    const typedKey = key as keyof T
+    if (!predicate(object[typedKey], typedKey)) {
+      result[typedKey] = object[typedKey]
+    }
+    return result
+  }, {} as Partial<T>)
+}

tests/collection.spec.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest'
-import { merge, mergeWith, cloneDeep, cloneDeepWith, isNumber, hasOwn } from '../src'
+import { merge, mergeWith, cloneDeep, cloneDeepWith, isNumber, hasOwn, pick, omit, pickBy, omitBy } from '../src'
 
 it('should merge two objects', () => {
   const result = merge({ a: 1, b: { c: 2 } }, { b: { d: 3 }, e: 4 })
@@ -344,3 +344,59 @@ describe('cloneDeepWith', () => {
     expect(result).toEqual({ a: 2, b: 3 })
   })
 })
+
+const sampleObject = {
+  a: 1,
+  b: 'hello',
+  c: true,
+  d: null,
+  e: 5,
+}
+
+describe('pick', () => {
+  it('should pick specified keys from an object', () => {
+    const result = pick(sampleObject, ['a', 'b'])
+    expect(result).toEqual({ a: 1, b: 'hello' })
+  })
+
+  it('should return an empty object if no keys match', () => {
+    const result = pick(sampleObject, [])
+    expect(result).toEqual({})
+  })
+})
+
+describe('omit', () => {
+  it('should omit specified keys from an object', () => {
+    const result = omit(sampleObject, ['a', 'b'])
+    expect(result).toEqual({ c: true, d: null, e: 5 })
+  })
+
+  it('should return the full object if no keys are omitted', () => {
+    const result = omit(sampleObject, [])
+    expect(result).toEqual(sampleObject)
+  })
+})
+
+describe('pickBy', () => {
+  it('should pick properties based on a predicate function', () => {
+    const result = pickBy(sampleObject, (value) => typeof value === 'number')
+    expect(result).toEqual({ a: 1, e: 5 })
+  })
+
+  it('should return an empty object if no properties match the predicate', () => {
+    const result = pickBy(sampleObject, (value) => typeof value === 'object')
+    expect(result).toEqual({ d: null })
+  })
+})
+
+describe('omitBy', () => {
+  it('should omit properties based on a predicate function', () => {
+    const result = omitBy(sampleObject, (value) => value === null || value === true)
+    expect(result).toEqual({ a: 1, b: 'hello', e: 5 })
+  })
+
+  it('should return the full object if no properties match the predicate', () => {
+    const result = omitBy(sampleObject, (value) => typeof value === 'symbol')
+    expect(result).toEqual(sampleObject)
+  })
+})