Sorting

After ES 2017

[...myArray].sort(mySortFunction); 

Sorting Numbers in an Array

Numbers are not sorted alphabetical order
The function must return a zero if the numbers are equal.
The function must return a negative number if the items are in the correct sequence
The function must return a positive number if the items need to be swapped.

write([6, 4, 2, 27, 17].sort( function (first, second) { 
   return first - second; 
} 

Sorting an Array of Key-Value pairs

myArrayOfObjects = [ 
   { name: "one", age:5 }, 
   { name: "two", age:8 } 
]; 

function sortByAge(a, b) { 
   if (a.age === b.age) { 
      return 0; 
   } 
   return a.age - b.age; 
}; 

const sortByName(a, b) => { 
   if (a.name === b.name) { 
      return 0; 
   } 
   return a.name > b.name ? 1 : -1; 
}; 

const newArray = myArrayOfObjects.sort(sortByName);   // this changes the original array 
const newArray = [ ...myArrayOfObjects].sort(sortByName);  // this makes a copy first