What is the difference between the following two for loops, one has curly braces , the other doesn&#-CodePudding

With curly braces

const numbers = [1. -1, 2, 3];

let sum = 0;
for (let n of numbers)
  sum  = n;

console.log(sum)

the console printed the integer 5

Now, the curly braces have been added to the for loops

const numbers = [1, -1, 2, 3]

let sum = 0;

//for loops
for (let n of numbers){
  sum =  n;
}
console.log(sum)

the console printed the integer 3 instead

why?

CodePudding user response：

"= " isn't a valid operator, so the 2nd loop just sets sum to whatever n is in the current iteration. Since 3 is the last item in the iterated array, sum equals 3 after the loop completes.

CodePudding user response：

Either you wrote curly braces or not they are all the same only one difference is that only one statement can be written without curly braces and infinity with them; the problem is in your code the first array is const numbers = [1. -1, 2, 3]; and the second is const numbers = [1, -1, 2, 3]