To find the smallest integer in an array, we can use various methods. Firstly, let’s use the Math.min() method:

let arr = [23, -3, 0, 1, 78, 66, 1000];
let smallestInt = Math.min(...arr);
console.log(smallestInt);

// returns -3 to the console

Using reduce() method:

let arr = [0,-4,89,678,1000,-44];
let result = arr.reduce(function(prev, curr) {
      return prev < curr ? prev : curr;
    });

console.log(result);

// returns -44

Let’s break down Example 2 now using some visuals for you to understand:

We have [0,-4,89,678,1000,-44].
We have 'prev' and 'curr' in a sort of a recursion here.

Now, in [0,-4], -4 is the smallest.
In [-4,89], -4 is the smallest.
In [-4,678], -4 is the smallest.
In [-4,1000], again -4 is the smallest.
Finally, in [-4,-44], -44 is the smallest.

// Hence, the method returns -44.

Other ways to do this:

findSmallestInteger = arr => Math.min(...arr);
findSmallestInteger([2,3,4,5,6,7,8]);

// outputs 2

const args = [23,4,56,77,2];
const  result = args.reduce((a, b) => b < a ? b : a, +Infinity); 
console.log(result);

// outputs 2