Add isFunction method

Eli-FreeCodeCamp-Projects · Oct 20, 2023 · a4f17b8 · a4f17b8
1 parent 1890a91
commit a4f17b8
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Showing 2 changed files with 18 additions and 0 deletions.
diff --git a/src/utils/utils.js b/src/utils/utils.js
@@ -13,6 +13,14 @@ export const ut = {
     toFixedFloat: (fNum, fix = 2, defaultValue = null) => {
         return (ut.isNumber(fNum) && ut.isNumber(fix)) ? parseFloat(fNum.toFixed(fix)) : defaultValue;
     },
+    /**
+     * Test if value is a valid function
+     * @param value {object} The value to test
+     * @return {boolean} Return true if value is a valid function
+     */
+    isFunction: (value) => {
+        return typeof value === "function" 
+    },
     /**
      * Test if value is a valid object
      * @param value {object} The value to test

diff --git a/test/utils.test.js b/test/utils.test.js
@@ -10,6 +10,16 @@ test('test toFixedFloat method', () => {
     expect(ut.toFixedFloat('hello', 2, 0)).toBe(0)
 })
 
+test('test isFunction method', () => {
+    const funcTest = ()=>{return true;}
+    expect(ut.isFunction(funcTest)).toBe(true)
+    expect(ut.isFunction({})).toBe(false)
+    expect(ut.isFunction({a: 1})).toBe(false)
+    expect(ut.isFunction("hello")).toBe(false)
+    expect(ut.isFunction(['a'])).toBe(false)
+    expect(ut.isFunction(2)).toBe(false)
+})
+
 test('test isObject method', () => {
     expect(ut.isObject({})).toBe(true)
     expect(ut.isObject({a: 1})).toBe(true)