fix: optimised armstrongNumber code (TheAlgorithms#1374)

developerr-ayush · web-flow · commit 964ba049d7ab · 2023-09-30T17:35:27.000+05:30
diff --git a/Maths/ArmstrongNumber.js b/Maths/ArmstrongNumber.js
@@ -9,16 +9,13 @@
 */
 
 const armstrongNumber = (num) =>{
- if (num < 0 || typeof num !== 'number') return false
-
- let newSum = 0
-
- const numArr = num.toString().split('')
- numArr.forEach((num) =>{
- newSum += parseInt(num) ** numArr.length
- })
-
- return newSum === num
+ if (typeof num !== 'number' || num < 0) return false
+ const numStr = num.toString()
+ const sum = [...numStr].reduce(
+ (acc, digit) => acc + parseInt(digit) ** numStr.length,
+ 0
+ )
+ return sum === num
 }
 
 export{armstrongNumber }

-Original file line number
+Diff line change
  */
 constarmstrongNumber=(num)=>{
 -if(num<0||typeofnum!=='number')returnfalse
+-
 -letnewSum=0
+-
 -constnumArr=num.toString().split('')
 -numArr.forEach((num)=>{
 -newSum+=parseInt(num)**numArr.length
 -})
+-
 -returnnewSum===num
 +if(typeofnum!=='number'||num<0)returnfalse
 +constnumStr=num.toString()
 +constsum=[...numStr].reduce(
 +(acc,digit)=>acc+parseInt(digit)**numStr.length,
 +0
 +)
 +returnsum===num
+}
 export{armstrongNumber}