2.8 KiB
2.8 KiB
id, title, challengeType
id | title | challengeType |
---|---|---|
587d8253367417b2b2512c6b | Remove from a Set | 1 |
Description
Instructions
this.remove
. This function should accept a value and check if it exists in the set. If it does, remove that value from the set, and return true
. Otherwise, return false
.
Tests
tests:
- text: Your <code>Set</code> class should have a <code>remove</code> method.
testString: assert((function(){var test = new Set(); return (typeof test.remove === 'function')}()), 'Your <code>Set</code> class should have a <code>remove</code> method.');
- text: Your <code>remove</code> method should only remove items that are present in the set.
testString: assert.deepEqual((function(){var test = new Set(); test.add('a');test.add('b');test.remove('c'); return test.values(); })(), ['a', 'b'], 'Your <code>remove</code> method should only remove items that are present in the set.');
- text: Your <code>remove</code> method should remove the given item from the set.
testString: assert((function(){var test = new Set(); test.add('a');test.add('b');test.remove('a'); var vals = test.values(); return (vals[0] === 'b' && vals.length === 1)}()), 'Your <code>remove</code> method should remove the given item from the set.');
Challenge Seed
function Set() {
// the var collection will hold the set
var collection = [];
// this method will check for the presence of an element and return true or false
this.has = function(element) {
return (collection.indexOf(element) !== -1);
};
// this method will return all the values in the set
this.values = function() {
return collection;
};
// this method will add an element to the set
this.add = function(element) {
if(!this.has(element)){
collection.push(element);
return true;
}
return false;
};
// change code below this line
// change code above this line
}
Solution
function Set() {
var collection = [];
this.has = function(element) {
return (collection.indexOf(element) !== -1);
};
this.values = function() {
return collection;
};
this.add = function(element) {
if(!this.has(element)){
collection.push(element);
return true;
}
return false;
};
this.remove = function(element){
if (this.has(element)){
collection.splice(collection.indexOf(element), 1);
return true;
}
return false;
}
}