Javascript find / search in array #javascript #js

js_filter.js

var original = [1, 2, 7, 42, 99, 101];

// Get items bigger than 10
var biggerThanTen = original.filter(function (item) {
	return item > 10;
});

// Get items smaller than 10
var smallerThanTen = original.filter(function (item) {
	if (item < 10) {
		return true;
	}
});

// Logs [42, 99, 101]
console.log(biggerThanTen);

// Logs [1, 2, 7]
console.log(smallerThanTen);

// With find
var sandwiches = ['turkey', 'chicken salad', 'tuna', 'pb&j', 'egg salad'];

var getTuna = sandwiches.find(function (sandwich) {
	return sandwich === 'tuna';
});

// Logs "tuna"
console.log(getTuna);

var todos = [
	{
		item: 'Wash the dog',
		added: 2018-03-22,
		completed: false
	},
	{
		item: 'Plan surprise party for Bailey',
		added: 2018-03-14,
		completed: false
	},
	{
		item: 'Go see Black Panther',
		added: 2018-03-12,
		completed: true
	},
	{
		item: 'Launch a podcast',
		added: 2018-03-05,
		completed: false
	}
];

var item = todos.find(function (todo) {
	return todo.item === 'Go see Black Panther';
});

// every
// Returns true
[12, 25, 42, 99, 101].every(function (item) {
	return item > 10;
});

// Returns false
[1, 12, 25, 42, 99, 101].every(function (item) {
	return item > 10;
});

// some
// Returns true
[12, 25, 42, 99, 101].some(function (item) {
	return item > 10;
});

// Returns true
[1, 12, 25, 42, 99, 101].some(function (item) {
	return item > 10;
});

// Returns false
[1, 1, 3, 7, 9, 10].some(function (item) {
	return item > 10;
});