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“Hoisting is a behavior of Java whereby all the function and variable declarations move to the top.” (You may also be expected to explain local variables and global variables)
3.What is Node.Js?
4. What is the IsNaN function?
“The IsNaN method or function returns a DataFrame object true for ‘nan’ or not a number value where all values are replaced with a boolean value. Otherwise, it returns false.”
5. What are undefined and undeclared variables?
“Undeclared variables are those that do not exist in a program and are not declared. Undefined variables are those that are declared but which have not been given a value.” (This question may tie into global variables and the details of function declaration as well as function names or function scope).
6. What does NULL mean in Java?
“NULL represents no value or no object. It implies that there is a null string or no object, no boolean value, or no valid one at least, and no array object.”
7. What is Strict Mode and how can it be enabled?
“Strict Mode changes accept bad syntax into real errors, thereby highlighting problems. For example, in normal Java, mistyping a variable name would create a new global variable. In Strict Mode, this is not possible because it will throw a reference error. Strict Mode is enabled by adding the strong literal ‘use strict’ above the file in question.”
8.What is a type of operator?
“The typeof operator is used to return a string description to the type of a global or local variable.”
“An anonymous function is one that is declared without any named identifier. These are generally inaccessible after their declaration.” (You may also be expected to discuss the importance of variable name or function expressions in your answer.)
11. Explain negative infinity.
“Debugging is the routine process of locating and removing errors or abnormalities from programs”
13. Explain operator.
“=== is a strict equality operator. This means it returns true when the two operands have the same value without the need for conversion.”
14.What is the difference between local scope and global scope?
“Global variables are useful for relatively constant values, while local variables are declared within a function block. Global scope encompasses the whole program. Thus, any change in global variables impacts the whole program. Local scope, by contrast, is limited.”
16.What does const mean when placed in code?
17. Explain VAR X here. (can be asked about any segment of code)
(Explain the function of the highlighted feature or code, you may also be asked more about the VAR keyword).
“You can use the concatenation or concat() method to merge strings. The concatenation operator allows for the merging of the contents of two strings to create one larger string.”
19. What is the console.log function?
“The console.log function is used to display log messages to the browser console.”
20.What is DOM in Java?
“DOM or the document object model is an official recommendation of W3C. It defines the interface that lets programs access and update XML documents.” (This may tie into things like innerhtml).
“Asynchronous codes allow a program to be executed straight away whereas synchronous codes would block the execution of the code until the completion of the code currently being executed.”
“SAX or simple API for XML is an event-based XML parser. This doesn’t load a whole XML document.”
In addition to these specific basic questions. you may also be asked things like “explain the following code” or be asked to demonstrate or explain concepts as simple as initialization or iteration to show proficiency with a supplementary tool like JQuery. You may also be asked to complete short, timed tasks using the scripting language. If you know that there are areas of weakness in your Java knowledge, watch some tutorials in those areas before your interview to refresh your knowledge.
When you have a job interview for a programmer position (or a position of any kind, really), you should ask about the company’s goals and challenges, the culture in the working environment and the job role rather than pay or benefits. See our page on questions you should ask an interviewer for more suggestions.
The best thing that you can do is use a Java tester online to make sure that your code makes sense during your interview preparation. That way you can deal with any issues beforehand rather than having to react in the interview if something goes awry.