Array.prototype.sort()

const months = ["March", "Jan", "Feb", "Dec"];
months.sort();
console.log(months);
// Expected output: Array ["Dec", "Feb", "Jan", "March"]

const array1 = [1, 30, 4, 21, 100000];
array1.sort();
console.log(array1);
// Expected output: Array [1, 100000, 21, 30, 4]

arr.sort([compareFunction]);

function compare(a, b) {
  if (a is less than b by some ordering criterion) {
    return -1;
  }
  if (a is greater than b by the ordering criterion) {
    return 1;
  }
  // a must be equal to b
  return 0;
}

function compareNumbers(a, b) {
  return a - b;
}

var numbers = [4, 2, 5, 1, 3];
numbers.sort(function (a, b) {
  return a - b;
});
console.log(numbers);

// [1, 2, 3, 4, 5]

var items = [
  { name: "Edward", value: 21 },
  { name: "Sharpe", value: 37 },
  { name: "And", value: 45 },
  { name: "The", value: -12 },
  { name: "Magnetic", value: 13 },
  { name: "Zeros", value: 37 },
];

// value  
items.sort(function (a, b) {
  if (a.value > b.value) {
    return 1;
  }
  if (a.value < b.value) {
    return -1;
  }
  // a must be equal to b
  return 0;
});

// name  
items.sort(function (a, b) {
  var nameA = a.name.toUpperCase(); // ignore upper and lowercase
  var nameB = b.name.toUpperCase(); // ignore upper and lowercase
  if (nameA < nameB) {
    return -1;
  }
  if (nameA > nameB) {
    return 1;
  }

  //   
  return 0;
});

var stringArray = ["Blue", "Humpback", "Beluga"];
var numericStringArray = ["80", "9", "700"];
var numberArray = [40, 1, 5, 200];
var mixedNumericArray = ["80", "9", "700", 40, 1, 5, 200];

function compareNumbers(a, b) {
  return a - b;
}

console.log("stringArray:", stringArray.join());
console.log("Sorted:", stringArray.sort());

console.log("numberArray:", numberArray.join());
console.log("Sorted without a compare function:", numberArray.sort());
console.log("Sorted with compareNumbers:", numberArray.sort(compareNumbers));

console.log("numericStringArray:", numericStringArray.join());
console.log("Sorted without a compare function:", numericStringArray.sort());
console.log(
  "Sorted with compareNumbers:",
  numericStringArray.sort(compareNumbers),
);

console.log("mixedNumericArray:", mixedNumericArray.join());
console.log("Sorted without a compare function:", mixedNumericArray.sort());
console.log(
  "Sorted with compareNumbers:",
  mixedNumericArray.sort(compareNumbers),
);

var items = ["rserv", "premier", "clich", "communiqu", "caf", "adieu"];
items.sort(function (a, b) {
  return a.localeCompare(b);
});

// items is ['adieu', 'caf', 'clich', 'communiqu', 'premier', 'rserv']

//   
var list = ["Delta", "alpha", "CHARLIE", "bravo"];

//        .
var mapped = list.map(function (el, i) {
  return { index: i, value: el.toLowerCase() };
});

//       
mapped.sort(function (a, b) {
  return +(a.value > b.value) || +(a.value === b.value) - 1;
});

//    
var result = mapped.map(function (el) {
  return list[el.index];
});