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step-13.html
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<!DOCTYPE html>
<html lang=en>
<head>
<title>Hands on with lodash</title>
<script src=js/angular.js></script>
<script src=js/lodash.js></script>
<script src=js/buildings.js></script>
<link href=css/main.css rel=stylesheet>
</head>
<body ng-app=myapp>
<div ng-controller=BuildingsController>
<h2>World's 50 Largest Buildings</h2>
<p><strong>Sort By:</strong>
<a href ng-click="sortBy('name')">Name</a> |
<a href ng-click="sortBy('country')">Country</a> |
<a href ng-click="sortBy('city')">City</a> |
<a href ng-click="sortBy('floors')">Floors</a> |
<a href ng-click="sortBy('year')">Year</a>
<p><strong>Sort By Multiple:</strong>
<a href ng-click="sortMultiple(['year','height'])">Year then Height</a>
<p><strong>Limit data to:</strong>
<a href ng-click="limitToChina()">China</a> |
<a href ng-click="limitTo('country')">Country</a> |
<a href ng-click="limitTo('city')">City</a> |
<a href ng-click="limitTo('floors')">Floors</a> |
<a href ng-click="limitTo('year')">Year</a>
<p><strong>Tell me:</strong>
<a href ng-click="combinedHeight()">Combined Height?</a> |
<a href ng-click="uniqueFloors()">Unique Floors?</a> |
<a href ng-click="oldest()">Oldest?</a> |
<a href ng-click="anyInCountry()">Any in the given country?</a> |
<p>
<a href ng-click="reset()">(Reset)</a>
<table>
<tr>
<th>Rank
<th>Name
<th>Country
<th>City
<th>Height
<th>Floors
<th>Year
<tr ng-repeat="building in buildings">
<td>{{building.rank}}
<td>{{building.name}}
<td>{{building.country}}
<td>{{building.city}}
<td>{{building.height}} ft
<td>{{building.floors}}
<td>{{building.year}}
</table>
</div>
<script>
angular.module("myapp", [])
.controller("BuildingsController", function($scope) {
$scope.reset = function reset() {
$scope.buildings = buildings;
};
$scope.reset();
// OUR FUNCTIONS
$scope.sortBy = function sortBy(field) {
// JavaScript's built-in sort function
$scope.buildings = buildings.sort(function(a, b) {
return a[field] > b[field];
});
};
$scope.sortBy = function sortBy(field) {
// lodash sort by "iteratee"
$scope.buildings = _.sortBy(buildings, field);
};
$scope.sortMultiple = function sortMultiple(fields) {
// lodash can sort by multiple fields
$scope.buildings = _.sortByAll(buildings, fields);
};
$scope.limitToChina1 = function limitToChina1() {
// filtering with a for loop
$scope.buildings = [];
for (var i = 0; i < buildings.length; i++) {
if (buildings[i].country == 'China') {
$scope.buildings.push(buildings[i]);
}
}
};
$scope.limitToChina2 = function limitToChina2() {
// filtering with Array.prototype.forEach
$scope.buildings = [];
buildings.forEach(function(building) {
if (building.country == 'China') {
$scope.buildings.push(building);
}
});
};
$scope.limitToChina3 = function limitToChina3() {
// filtering with Array.prototype.filter
$scope.buildings = buildings.filter(function(building) {
return (building.country == 'China');
});
};
$scope.limitToChina4 = function limitToChina4(field) {
// filtering with _.where()
$scope.buildings = _.where(buildings, {'country':'China'});
// but is _.where() fast?
// perf test: http://jsperf.com/array-prototype-filter-vs-lodash-where
// # of iterations is super high
// actually faster on FireFox
};
$scope.limitTo = function limitTo(field) {
// build up a criteria field
var criteria = {};
criteria[field] = value;
// oh but wait, _.where() uses strict comparison
$scope.buildings = _.where(buildings, criteria);
};
$scope.limitTo = function limitTo(field) {
// build up a criteria field
var value = prompt('Limit data to what ' + field + '?');
if (field == 'height' || field == 'floors' || field == 'year') {
// _.where() uses strict comparison
value = parseFloat(value);
}
var criteria = {};
criteria[field] = value;
$scope.buildings = _.where(buildings, criteria);
};
$scope.combinedHeight = function combinedHeight() {
// oh boy, this function nesting is cumbersome
// alert( _.sum(_.pluck(buildings, 'height')) + ' ft' );
// but lodash has a fluent API!
alert( _(buildings).pluck('height').sum() + ' ft' );
// beware that the fluent interface is not a true array
alert( _.isArray(_(buildings).pluck('height')) );
alert( _.isArray(_(buildings).pluck('height').value()) );
};
$scope.uniqueFloors = function uniqueFloors() {
// three operations... now fluency is really great
alert( _(buildings).pluck('floors').uniq().sortBy().value().join(', ') );
};
$scope.oldest = function oldest() {
// Find the name of the building with the lowest year
alert( _.min(buildings, 'year').name );
};
$scope.anyInCountry = function anyInCountry() {
var country = prompt('Type a country name.');
// _.some() with criteria
var hasSome = _.some(buildings, {country:country});
alert( hasSome ? country + ' HAS one or more buildings.' : country + ' DOES NOT HAVE ANY buildings.' );
};
// END OUR FUNCTIONS
});
</script>