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// 1: how could you rewrite the following to make it shorter? | |
/*if (foo) { | |
bar.doSomething(el); | |
} else { | |
bar.doSomethingElse(el); | |
}*/ | |
(foo) ? bar.doSomething(el) : bar.doSomethingElse(el); | |
// 2: what is the faulty logic in the following code? | |
var foo = 'hello'; | |
(function() { | |
var foo = foo || 'world'; //local foo overrides global variable, will always equal 'world' | |
console.log(foo); | |
})(); | |
//fixed | |
var foo = 'hello'; | |
(function(gfoo) { | |
var foo = gfoo || 'world'; | |
console.log(foo); | |
})(foo); | |
// 3: given the following code, how would you override the value of the bar | |
// property for the variable foo without affecting the value of the bar | |
// property for the variable bim? how would you affect the value of the bar | |
// property for both foo and bim? how would you add a method to foo and bim to | |
// console.log the value of each object's bar property? how would you tell if | |
// the object's bar property had been overridden for the particular object? | |
/*var Thinger = function() { | |
return this; | |
}; | |
Thinger.prototype = { | |
bar : 'baz' | |
}; | |
var foo = new Thinger(), | |
bim = new Thinger();*/ | |
var Thinger = function() { | |
return this; | |
}; | |
Thinger.prototype = { | |
bar : 'baz', | |
writeBar : function() { console.log(this.bar); } | |
}; | |
var foo = new Thinger(), | |
bim = new Thinger(); | |
foo.bar = "foobar"; | |
// Depends on the meaning of "affect" | |
foo.bar = "foobar"; | |
bim.bar = "bimbar"; | |
foo.writeBar(); | |
bim.writeBar(); | |
foo["bar"] = "foobar2"; | |
bim["bar"] = "bimbar2" | |
foo.writeBar(); | |
bim.writeBar(); | |
// or | |
Thinger.prototype = { | |
bar : "hootie" | |
}; | |
foo = new Thinger(); | |
bim = new Thinger(); | |
//You can determine if an objects property is defined in itself or it's prototype using the hasOwnProperty method. | |
foo.bar.hasOwnProperty(); | |
// 4: given the following code, and assuming that each defined object has a | |
// 'destroy' method, how would you destroy all of the objects contained in the | |
// myObjects object? | |
var myObjects = { | |
thinger : new myApp.Thinger(), | |
gizmo : new myApp.Gizmo(), | |
widget : new myApp.Widget() | |
}; | |
for(o in myObjects) | |
{ | |
o.destroy(); | |
} | |
// 5: given the following array, create an array that contains the contents of | |
// each array item repeated three times, with a space between each item. so, | |
// for example, if an array item is 'foo' then the new array should contain an | |
// array item 'foo foo foo'. (you can assume the library of your choice is | |
// available) | |
var myArray = [ 'foo', 'bar', 'baz' ]; | |
// 6: how could you improve the following code? | |
$(document).ready(function() { | |
$('.foo #bar').css('color', 'red'); | |
$('.foo #bar').css('border', '1px solid blue'); | |
$('.foo #bar').text('new text!'); | |
$('.foo #bar').click(function() { | |
$(this).attr('title', 'new title'); | |
$(this).width('100px'); | |
}); | |
$('.foo #bar').click(); | |
}); | |
// 7: what issues do you see with the following code? how would you fix it? | |
(function() { | |
var foo; | |
dojo.xhrGet({ | |
url : 'foo.php', | |
load : function(resp) { | |
foo = resp.foo; | |
} | |
}); | |
if (foo) { | |
// run this important code | |
} | |
})(); | |
// 8: how could you rewrite the following code to make it shorter? | |
(function(d, $){ | |
$('li.foo a').attr('title', 'i am foo'); | |
$('li.bar a').attr('title', 'i am bar'); | |
$('li.baz a').attr('title', 'i am baz'); | |
$('li.bop a').attr('title', 'i am bop'); | |
})(dojo, dojo.query); | |
// 9: how would you improve the following code? | |
for (i = 0; i <= 100; i++) { | |
$('#thinger').append('<p><span class="thinger">i am thinger ' + i + '</span></p>'); | |
$('#gizmo').append('<p><span class="gizmo">i am gizmo ' + i + '</span></p>'); | |
} | |
// 10: a user enters their desired tip into a text box; the baseTotal, tax, | |
// and fee values are provided by the application. what are some potential | |
// issues with the following function for calculating the total? | |
function calculateTotal(baseTotal, tip, tax, fee) { | |
return baseTotal + tip + tax + fee; | |
} | |
// 11: given the following data structure, write code that returns an array | |
// containing the name of each item, followed by a comma-separated list of | |
// the item's extras, if it has any. e.g. | |
// | |
// [ "Salad (Chicken, Steak, Shrimp)", ... ] | |
// | |
// (you can assume the library of your choice is available) | |
var menuItems = [ | |
{ | |
id : 1, | |
name : 'Salad', | |
extras : [ | |
'Chicken', 'Steak', 'Shrimp' | |
] | |
}, | |
{ | |
id : 2, | |
name : 'Potato', | |
extras : [ | |
'Bacon', 'Sour Cream', 'Shrimp' | |
] | |
}, | |
{ | |
id : 3, | |
name : 'Sandwich', | |
extras : [ | |
'Turkey', 'Bacon' | |
] | |
}, | |
{ | |
id : 4, | |
name : 'Bread' | |
} | |
]; | |
// BONUS: what is the faulty logic in the following code? how would you fix it? | |
var date = new Date(), | |
day = date.getDate(), | |
month = date.getMonth(), | |
dates = []; | |
for (var i = 0; i <= 5; i++) { | |
dates.push(month + '/' + (day + i)); | |
} | |
console.log('The next five days are ', dates.join(', ')); |
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