maxAdjacentProduct is a function designed to determine the highest product of adjacent elements in an array and return that value.
function maxAdjacentProduct(arr) {
return Math.max(...arr.slice(1).map((x, i) => [x * arr[i]]))
}maxAdjacentProduct is a function designed to determine the highest product of adjacent elements in an array and return that value.
function maxAdjacentProduct(arr) {
return Math.max(...arr.slice(1).map((x, i) => [x * arr[i]]))
}The function runs in the following manner:
It starts by creating a copy of the original array using slice(1), which essentially removes the first element and generates a new array.
Next, it iterates over the newly created array using the map function. The callback function for map takes two parameters:
x - The value of the current element,i - The index of the current element.In this step, each element in the new array is multiplied with the corresponding element from the original array at the same index. This results in a new array containing products of adjacent elements.
This resulting array of products is then passed as separate arguments to Math.max() using the spread operator to find the maximum value among them.
Example: Consider the original array -
[3,4,8,2,1]
A new array without the first element is created: newArr = [4,8,2,1]
The map function operates on this new array, calculating the product of each element with its adjacent element in the original array:
x = 4 and i = 0 results in 12.
x = 8 and i = 1 gives 32.
x = 2 and i = 2 produces 16.
x = 1 and i = 3 yields 2.
The map function returns an array of these calculated values: [12,32,16,2]. These values are then passed to Math.max() to find the maximum, resulting in 32.
const myArr = [3,4,8,2,1];
function adjacentElementsProduct(arr) {
return Math.max(...arr.slice(1).map((x, i) => [x * arr[i]]))
}
console.log(adjacentElementsProduct(myArr))Hopefully, this explanation clarifies things.
Therefore:
arr.slice(1) will return all elements in the array except for the first one.map((x,i)=>[x*arr[i]]) creates an array with products of each element and its neighbor, starting from the second element as we removed the first one previously. This results in something like [[first number * second], [second * third], [third * fourth], ...]...result represents the spread operator, which passes each element in the array result as individual parameters to Math.max, allowing us to find the maximum value easilyMath.max(...result) simply returns the maximum element among the list passed as argumentsIn summary:
function adjacentElementsProduct(arr) {
let res = arr.slice(1); // excludes the first element
res = res.map((x,i)=>x*arr[i]) // resulting array: [[first number * third], [third * fourth], ...]
return Math.max(...res) // maximum value of res
}
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