JavaScript Basic HW

gistfile1.txt

// What is the return value of the below code sample? Provide a sentence or two of explanation.
typeof( 15 );

* 'number', 15 is an integer.

// What is the return value of the below code sample? Provide a sentence or two of explanation.
typeof( "hello" );

*'String'', there are characters between quotes.

// What is the return value of the below code sample? Provide a sentence or two of explanation.
typeof( [ "dog", "cat", "horse" ] );

* It would return 'array' because it is a list of value, in this case strings.

// What is the return value of the below code sample? Provide a sentence or two of explanation.
typeof( NaN );

* It would return 'number' because NaN is somehow a number? Why Javascript?

// What is the return value of the below code sample? Provide a sentence or two of explanation.
"hamburger" + "s";

* It would return "hamburgers" as we are concatenating two strings

// What is the return value of the below code sample? Provide a sentence or two of explanation.
"hamburgers" - "s";

* It would return NaN because there is no way to subtract strings.

// What is the return value of the below code sample? Provide a sentence or two of explanation.
"johnny" + 5;

*Returns "Johnny5" because of type coercion.

// What is the return value of the below code sample? Provide a sentence or two of explanation.
99 * "luftbaloons";

* Returns NaN because in JS a string may not be multiplied.

// What will the contents of the below array be after the below code sample is executed.
var numbers = [ 2, 4, 6, 8 ];
numbers.pop();
numbers.push( 10 );
numbers.unshift( 3 );

*numbers = [3, 2, 4, 6, 10];

// What is the return value of the below code sample?
var morse = [ "dot", "pause", "dot" ];
var moreMorse = morse.join( " dash " );
moreMorse.split( " " );

*will return an array with ["dot", "dash", "pause", "dash", "dot"]


// What will the contents of the below array be after the below code sample is executed.
var bands = [];
var beatles = [ "Paul", "John", "George", "Pete" ];
var stones = [ "Brian", "Mick", "Keith", "Ronnie", "Charlie" ];
bands.push( beatles );
bands.unshift( stones );
bands[ bands.length - 1 ].pop(); //pete is gone
bands[0].shift(); //brian is gone
bands[1][3] = "Ringo";

bands = [["Mick","Keith","Ronnie", "Charlie"]["Paul", "John", "George", "Ringo"]]