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ivanteoh/166-homework1.js

Created July 6, 2020 10:58
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Javascript: 101 Week 2 Track 1
Raw
166-homework1.js
function absolute(number) {
if (number < 0)
return -number;
return number;
}
Raw
166-homework2.js
function greaterThan(number1) {
function test(number2) {
return number2 > number1;
}
return test;
}
var greaterThanTwenty = greaterThan(20);
alert(greaterThanTwenty(52));
alert(greaterThanTwenty(10));
Raw
166-homework3.js
//A constant to hold the String "null". To be used in typeof checks
NULL_VAL = "null";
//A constant to hold the String "undefined". To be used in typeof checks
UNDEFINED_VAL = "undefined";
/*
* This function checks if the specified parameter is null or undefined
* @param something The specified parameter to check for a null or undefined
* value
* @param name The name of the parameter. This will be used in the error message
* If the value 'something' is found to be null or undefined, then this method
* will throw an Error
*/
function checkNullOrUndefined(something, name) {
if(UNDEFINED_VAL == typeof(something)) {
throw new Error(name + " cannot be undefined");
}
if(NULL_VAL == typeof(something)) {
throw new Error(name + " cannot be null");
}
}
/*
* This function accepts an array object and a function reference.
* It iterates through the array and invokes the specified function
* for every element of the array. In each invocation the current
* array element is given to the function as a parameter.
* @param arr The array
* @param func The function to invoke for every element of the array
* This method does not return any specific value.
* This method throws an Error if 'arr' is null, undefined, or is not an array
* This method throws an Error if 'func' is null, undefined, or is not a
* function
*/
function iterateAndOperate(arr, func) {
checkNullOrUndefined(arr, "arr");
checkNullOrUndefined(func, "func");
// Verify that arr is an array
if(!(arr instanceof Array)) {
throw new Error("arr does not seem to be an array");
}
// Verify that arr is an array
if("function" != typeof(func)) {
throw new Error("func is not a function");
}
for(var i=0; i<arr.length; i++) {
func(arr[i]);
}
}
Raw
166-homework31.html
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<title>JavaScript 101</title>
<script type="text/javascript">
function load()
{
// A constant to hold the String "null". To be used in typeof checks
NULL_VAL = "null";
// A constant to hold the String "undefined". To be used in typeof
// checks
UNDEFINED_VAL = "undefined";
/*
* This function checks if the specified parameter is null or
* undefined
* @param something The specified parameter to check for a null or
* undefined value
* @param name The name of the parameter. This will be used in the
* error message
* If the value 'something' is found to be null or undefined, then
* this method
* will throw an Error
*/
function checkNullOrUndefined(something, name) {
if(UNDEFINED_VAL == typeof(something)) {
throw new Error(name + " cannot be undefined");
}
if(NULL_VAL == typeof(something)) {
throw new Error(name + " cannot be null");
}
}
/*
* This function accepts an array object and a function reference.
* It iterates through the array and invokes the specified function
* for every element of the array. In each invocation the current
* array element is given to the function as a parameter.
* @param arr The array
* @param func The function to invoke for every element of the array
* This method does not return any specific value.
* This method throws an Error if 'arr' is null, undefined, or is
* not an array
* This method throws an Error if 'func' is null, undefined, or is
* not a function
*/
function iterateAndOperate(arr, func) {
checkNullOrUndefined(arr, "arr");
checkNullOrUndefined(func, "func");
// Verify that arr is an array
if(!(arr instanceof Array)) {
throw new Error("arr does not seem to be an array");
}
// Verify that arr is an array
if("function" != typeof(func)) {
throw new Error("func is not a function");
}
for(var i = 0; i<arr.length; i++) {
func(arr[i]);
}
}
function draw(symbol) {
function plusDraw(sign) {
for (var j = 0; j < sign; j++) {
document.write("+");
}
}
var total = 9;
var plus = (total - symbol)/2;
plusDraw(plus);
for (var j = 0; j < symbol; j++) {
document.write("@");
}
plusDraw(plus);
document.write("<br />");
}
iterateAndOperate([1, 3, 5, 3, 1], draw);
}
</script>
</head>
<body onload="load()">
</body>
</html>
Raw
166-homework31.txt
++++@++++
+++@@@+++
++@@@@@++
+++@@@+++
++++@++++
Raw
166-homework32.html
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<title>JavaScript 101</title>
<script type="text/javascript">
function load()
{
// A constant to hold the String "null". To be used in typeof checks
NULL_VAL = "null";
// A constant to hold the String "undefined". To be used in typeof
// checks
UNDEFINED_VAL = "undefined";
/*
* This function checks if the specified parameter is null or
* undefined
* @param something The specified parameter to check for a null or
* undefined value
* @param name The name of the parameter. This will be used in the
* error message
* If the value 'something' is found to be null or undefined, then
* this method
* will throw an Error
*/
function checkNullOrUndefined(something, name) {
if(UNDEFINED_VAL == typeof(something)) {
throw new Error(name + " cannot be undefined");
}
if(NULL_VAL == typeof(something)) {
throw new Error(name + " cannot be null");
}
}
/*
* This function accepts an array object and a function reference.
* It iterates through the array and invokes the specified function
* for every element of the array. In each invocation the current
* array element is given to the function as a parameter.
* @param arr The array
* @param func The function to invoke for every element of the array
* This method does not return any specific value.
* This method throws an Error if 'arr' is null, undefined, or is
* not an array
* This method throws an Error if 'func' is null, undefined, or is
* not a function
*/
function iterateAndOperate(arr, func) {
checkNullOrUndefined(arr, "arr");
checkNullOrUndefined(func, "func");
// Verify that arr is an array
if(!(arr instanceof Array)) {
throw new Error("arr does not seem to be an array");
}
// Verify that arr is an array
if("function" != typeof(func)) {
throw new Error("func is not a function");
}
for(var i = 0; i < arr.length; i++) {
func(arr[i]);
}
}
function draw(symbol) {
for (var j = 0; j < symbol; j++) {
document.write("*");
}
document.write("<br />");
}
iterateAndOperate([1, 3, 5, 3, 1], draw);
}
</script>
</head>
<body onload="load()">
</body>
</html>
Raw
166-homework32.txt
*
***
*****
***
*
Raw
166-homework33.html
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<title>JavaScript 101</title>
<script type="text/javascript">
function load()
{
// A constant to hold the String "null". To be used in typeof checks
NULL_VAL = "null";
// A constant to hold the String "undefined". To be used in typeof
// checks
UNDEFINED_VAL = "undefined";
/*
* This function checks if the specified parameter is null or
* undefined
* @param something The specified parameter to check for a null or
* undefined value
* @param name The name of the parameter. This will be used in the
* error message
* If the value 'something' is found to be null or undefined, then
* this method
* will throw an Error
*/
function checkNullOrUndefined(something, name) {
if(UNDEFINED_VAL == typeof(something)) {
throw new Error(name + " cannot be undefined");
}
if(NULL_VAL == typeof(something)) {
throw new Error(name + " cannot be null");
}
}
/*
* This function accepts an array object and a function reference.
* It iterates through the array and invokes the specified function
* for every element of the array. In each invocation the current
* array element is given to the function as a parameter.
* @param arr The array
* @param func The function to invoke for every element of the array
* This method does not return any specific value.
* This method throws an Error if 'arr' is null, undefined, or is
* not an array
* This method throws an Error if 'func' is null, undefined, or is
* not a function
*/
function iterateAndOperate(arr, func) {
try {
checkNullOrUndefined(arr, "arr");
checkNullOrUndefined(func, "func");
// Verify that arr is an array
if(!(arr instanceof Array)) {
throw new Error("arr does not seem to be an array");
}
// Verify that arr is an array
if("function" != typeof(func)) {
throw new Error("func is not a function");
}
for(var i = 0; i < arr.length; i++) {
func(arr[i]);
}
}
catch(e){
alert('An error has occurred: '+e.message)
}
}
iterateAndOperate();
}
</script>
</head>
<body onload="load()">
</body>
</html>
Raw
166-reflection1.js
switch (expression) {
case 'a':
case 'b':
case 'c':
alphabet();
break;
default:
nonAlphabet();
}
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