feat: add isFinite, isInteger, isNaN

src/index.ts

@@ -12,7 +12,10 @@ export { default as inBrowser } from './inBrowser'
 export { default as isArray } from './isArray'
 export { default as isBoolean } from './isBoolean'
 export { default as isDate } from './isDate'
+export { default as isFinite } from './isFinite'
 export { default as isFunction } from './isFunction'
+export { default as isInteger } from './isInteger'
+export { default as isNaN } from './isNaN'
 export { default as isNil } from './isNil'
 export { default as isNull } from './isNull'
 export { default as isNumber } from './isNumber'

src/isFinite.ts

@@ -0,0 +1,9 @@
+/**
+ * 检查 value 是否是原始有限数值。
+ *
+ * @param value 要检查的值
+ * @returns 是（true）或否（false）
+ */
+export default function isFinite(value: any): boolean {
+  return Number.isFinite(value)
+}

src/isInteger.ts

@@ -0,0 +1,9 @@
+/**
+ * 检查 value 是否是一个整数。
+ *
+ * @param value 要检查的值
+ * @returns 是（true）或否（false）
+ */
+export default function isInteger(value: any): boolean {
+  return Number.isInteger(value)
+}

src/isNaN.ts

@@ -0,0 +1,9 @@
+/**
+ * 检查 value 是否是 NaN。
+ *
+ * @param value 要检查的值
+ * @returns 是（true）或否（false）
+ */
+export default function isNaN(value: any): boolean {
+  return value !== value
+}

test/index.test.ts

@@ -240,6 +240,47 @@ describe('isNumber', () => {
   })
 })
 
+describe('isFinite', () => {
+  test('是', () => {
+    expect(vtils.isFinite(0)).toBeTruthy()
+    expect(vtils.isFinite(-99999999)).toBeTruthy()
+    expect(vtils.isFinite(6666666666)).toBeTruthy()
+    expect(vtils.isFinite(Number.MIN_VALUE)).toBeTruthy()
+  })
+  test('不是', () => {
+    expect(vtils.isFinite(Infinity)).toBeFalsy()
+    expect(vtils.isFinite(Number.NEGATIVE_INFINITY)).toBeFalsy()
+    expect(vtils.isFinite(NaN)).toBeFalsy()
+  })
+})
+
+describe('isInteger', () => {
+  test('是', () => {
+    expect(vtils.isInteger(0)).toBeTruthy()
+    expect(vtils.isInteger(-99999999)).toBeTruthy()
+    expect(vtils.isInteger(6666666666)).toBeTruthy()
+  })
+  test('不是', () => {
+    expect(vtils.isInteger(1.2)).toBeFalsy()
+    expect(vtils.isInteger(Infinity)).toBeFalsy()
+    expect(vtils.isInteger(Number.NEGATIVE_INFINITY)).toBeFalsy()
+    expect(vtils.isInteger(NaN)).toBeFalsy()
+  })
+})
+
+describe('isNaN', () => {
+  test('是', () => {
+    expect(vtils.isNaN(NaN)).toBeTruthy()
+    expect(vtils.isNaN(1 / ('x' as any))).toBeTruthy()
+  })
+  test('不是', () => {
+    expect(vtils.isNaN(0)).toBeFalsy()
+    expect(vtils.isNaN(1.2)).toBeFalsy()
+    expect(vtils.isNaN(Infinity)).toBeFalsy()
+    expect(vtils.isNaN(Number.NEGATIVE_INFINITY)).toBeFalsy()
+  })
+})
+
 describe('isBoolean', () => {
   test('是', () => {
     expect(vtils.isBoolean(true)).toBeTruthy()