filter inside filter javascript code example

Example 1: angular array filter typescript

ngOnInit() {
  this.booksByStoreID = this.books.filter(
          book => book.store_id === this.store.id);
}

Example 2: how the filter() function works javascript

const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];

const filter = arr.filter((number) => number > 5);
console.log(filter); // [6, 7, 8, 9]

Example 3: array filter

const words = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];

const result = words.filter(word => word.length > 6);

console.log(result);
// expected output: Array ["exuberant", "destruction", "present"]

Example 4: filter array by keyword

var data = [
  {email: "[email protected]",nama:"User A", Level:"Super Admin"},
  {email: "[email protected]",nama:"User B", Level:"Super Admin"},
  {email: "[email protected]",nama:"User C", Level:"Standart"},
  {email: "[email protected]",nama:"User D", Level:"Standart"},
  {email: "[email protected]",nama:"User E", Level:"Admin"},
  {email: "[email protected]",nama:"User F", Level:"Standart"}
];
var filter = "Level";
var keyword = "Standart";

var filteredData = data.filter(function(obj) {
	return obj[filter] === keyword;
});

console.log(filteredData);

Example 5: filter items javascript

// Filter items
function filterItems(e) {
  // Convert to lowercase
  var text = e.target.value.toLowerCase();
  // Get lis
  var items = itemList.getElementsByTagName('li');
  // Convert to an array
  Array.from(items).forEach(function(item) {
    var itemName = item.firstChild.textContent;
    if (itemName.toLowerCase().indexOf(text) != -1) {
      item.style.display = 'block';
    } else {
      item.style.display = 'none';
    }
  });
}