Page 122 - JavaScript

or using arrow functions:

myArray.reduce((a, b) => Math.min(a, b)); // 1
myArray.reduce((a, b) => Math.max(a, b)); // 4

5.1

To generalize the reduce version we'd have to pass in an initial value to cover the empty list case:

function myMax(array) {
return array.reduce(function(maxSoFar, element) {
return Math.max(maxSoFar, element);
}, -Infinity);
}

myMax([3, 5]); // 5
myMax([]); // -Infinity
Math.max.apply(null, []); // -Infinity

For the details on how to properly use reduce see Reducing values.

Flattening Arrays

2 Dimensional arrays

6

In ES6, we can flatten the array by the spread operator ...:

function flattenES6(arr) {
return [].concat(...arr);
}

var arrL1 = [1, 2, [3, 4]];
console.log(flattenES6(arrL1)); // [1, 2, 3, 4]

5

In ES5, we can acheive that by .apply():

function flatten(arr) {
return [].concat.apply([], arr);
}

var arrL1 = [1, 2, [3, 4]];
console.log(flatten(arrL1)); // [1, 2, 3, 4]

Higher Dimension Arrays

Given a deeply nested array like so

https://riptutorial.com/ 79