4.5 KiB
4.5 KiB
id | title | challengeType |
---|---|---|
8d5823c8c441eddfaeb5bdef | Create a Map Data Structure | 1 |
Description
Map
object provided here as a wrapper around a JavaScript object
. Create the following methods and operations on the Map object:
add
accepts akey, value
pair to add to the map.remove
accepts a key and removes the associatedkey, value
pairget
accepts akey
and returns the storedvalue
has
accepts akey
and returns true if the key exists or false if it doesn't.values
returns an array of all the values in the mapsize
returns the number of items in the mapclear
empties the map
Instructions
Tests
tests:
- text: The Map data structure exists.
testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; return (typeof test == 'object')})(), 'The Map data structure exists.');
- text: 'The Map object has the following methods: add, remove, get, has, values, clear, and size.'
testString: 'assert((function() { var test = false; if (typeof Map !== ''undefined'') { test = new Map() }; return (typeof test.add == ''function'' && typeof test.remove == ''function'' && typeof test.get == ''function'' && typeof test.has == ''function'' && typeof test.values == ''function'' && typeof test.clear == ''function'' && typeof test.size == ''function'')})(), ''The Map object has the following methods: add, remove, get, has, values, clear, and size.'');'
- text: The add method adds items to the map.
testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; test.add(5,6); test.add(2,3); test.add(2,5); return (test.size() == 2)})(), 'The add method adds items to the map.');
- text: The has method returns true for added items and false for absent items.
testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; test.add('test','value'); return (test.has('test') && !test.has('false'))})(), 'The has method returns true for added items and false for absent items.');
- text: The get method accepts keys as input and returns the associated values.
testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; test.add('abc','def'); return (test.get('abc') == 'def')})(), 'The get method accepts keys as input and returns the associated values.');
- text: The values method returns all the values stored in the map as strings in an array.
testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; test.add('a','b'); test.add('c','d'); test.add('e','f'); var vals = test.values(); return (vals.indexOf('b') != -1 && vals.indexOf('d') != -1 && vals.indexOf('f') != -1)})(), 'The values method returns all the values stored in the map as strings in an array.');
- text: The clear method empties the map and the size method returns the number of items present in the map.
testString: assert((function() { var test = false; if (typeof Map !== 'undefined') { test = new Map() }; test.add('b','b'); test.add('c','d'); test.remove('asdfas'); var init = test.size(); test.clear(); return (init == 2 && test.size() == 0)})(), 'The clear method empties the map and the size method returns the number of items present in the map.');
Challenge Seed
var Map = function() {
this.collection = {};
// change code below this line
// change code above this line
};
Solution
// solution required