What can be done in order to avoid creation of global variables in JavaScript?

A To use a method that defines all the variables
B To use an object that has the reference to all the variables
C To use an object as its namespace
D To use global functions

Correct Answer: To use an object as its namespace

One way for a module to avoid the creation of global variables is to use an object as its namespace. Instead of defining global functions and variables, it stores the functions and values as properties of an object (which may be referenced to a global variable).
Bissoy MCQ
#JavaScript #Classes And Modules

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Which is the function in JavaScript that will print the current page in JavaScript?
A print()
B printcurrent()
C print(now)
D print(this)
In which format does JavaScript support external JavaScript?
A .js
B .php
C .js/php
D .jss
Which class provides an interface for invoking JavaScript methods and examining JavaScript properties?
A ScriptObject
B JSObject
C JavaObject
D Jobject
(i) What is global warming? How global warming affects the rapid change of climate? (ii) What are the bad impacts of climate change? (iii) How climate change affects the environment of Bangladesh (iv) How global warming can be minimized (v) What should be the role of students to protect the environment.
A (i) Global warming is the main natural reason and using harmful chemicals in everyday life the main reason created by men. The climate is changing rapidly that result in the rise of the earth's average temperature
B (ii) Climate change impacts include floods, cyclones, storm surges and drought, ice sheets melting which will seriously affect the agriculture and livelihood especially at the poor.
C (iii) Bangladesh is one of the largest deltas in the world which is highly vulnerable to Natural Disasters because of its Geographical location, Fiat and low-lying landscape, Population density, Poverty, Illiteracy, Lack of Institutional setup, etc.
D (iv) To reduce the bad impact of climate change people should be aware of. Tree plantation can reduce global warming which is the main natural reason for climate change. Stop using harmful chemicals can reduce environmental pollution which is the main man
E (v) Students should be careful to protect the environment and raise awareness. Thus the students can play a vital role to reduce bad impact of climate changes.
Which of the following are global functions that are not part of core JavaScript?
A spawn(f);
B trim();
C exult();
D eval()
What will be done if more than one page requires a file of JavaScript code?
A Downloads that many times
B Retrives from the browser cache
C Must be re executed
D Must be included in all the pages
Which are usually variables that are used internally in object methods and also are globally visible variables?
A Object properties
B Variable properties
C Method properties
D Internal properties
Which of the following global variables is used to get parameters?
A $HTTP_GET_VAR
B $HTTP_GET_VARS()
C $HTTP_GET_VARS
D $HTTP_GET_VARS
Where can a JavaScript code be placed in an html page?
A both a and b
B none of the above
Which of the following communicates with server-side CGI scripts through HTML form submissions and can be written without the use of JavaScript?
A Interactive Web Pages
B Static Web Pages
C Conditional Web Pages
D All web pages

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