The Constants or the variables are the heart of the program. They help store the values which help run the code. There is a difference between variables and constants is that the values of variables can be changed but the values of constants cannot be changed. In other words, variables can be updated while constants can not be updated.
I have taken the above code from Programming Assignmnet 1, from lines 24-25. In this code, I am declaring a variable named mark, which is taking input from the user. The function 'readline.question' is used to take input from the user. Since it is a variable and not a constant, the input can be changed later in the code if required.
Conditional Statements are used to instruct the computer on the decision to make when given some conditions. These decisions are made if and only if the pre-stated conditions are either true or false. One very popular type of conditional Statements are if-else if ladders.
I have taken the above code from Programming Assignment 1, from lines 65- 94. In this code, I am making an if-else if ladder which will print the grade of the student based on their average marks. If the average is between 100 and 90, their grade will be E. If the average is between 80 and 90, their grade will be C, and so on. If their average is below 0 or above 100, the conditional statements will return "Invalid Input entered. Check the marks entered previously."
Repetition Structures, also known as loops, are used to run a block of code multiple times until a certain condition is met.
I have taken the above code from Programming Assignment 1, from lines 50-53. In this code, I am declaring a for loop which will run until the variable 'i' is less than or equal to 'classStrength'. Inside the for loop, I am taking input from the user, i.e., the teacher in this case. The teacher will be entering the average marks of each student in the class. I am then adding all the student marks and storing it in the varianle 'classAvg'. In like 54 (which is not visible in the snpshot), I am dividing 'classAvg' by 'classStrength' to find the class average.
A built-in function is a function that is already available in a programming language. There are various types of built-in functions in JavaScript which include:
I have taken the code from Programming Assignment 1, from lines 98-101. In this code, I am taking input from the user, i.e., the teacher. I am storing this input in the variable 'input'. In the last two lines, I am manipulating the strings so that I can run the rest of the code. In line 100, I am using the string function '.trim()'. This function removes any whitespaces at the end of the input. In line 101, I am using the string function '.toUpperCase()'. This function changes all the lower case characters in the string to upper case.
A custom function is a function which is made by the programmer. This function can only be used in the program it is written in. In other words, each custom function is unique.
I have taken the above code from Programming Assignment 1, from lines 11-37. In this code, I am making a function named 'studentMarks' with 2 parameters, i.e., 'studentName' and 'noOfSubjects'. The variable 'studentName' stores the name of the student while 'noOfSubjects' stores the number of subjects the student has. In the function, first I am running an error check which will terminate the code if the number of subjects is less than 0. If the number of subjects is not zero, the function runs a while loop which will run until the variable 'i' is equal to the number of subjects. I am using the loop to take input from the user, i.e., the marks in each subject. At the end of the function, I am finding the average marks of the student and displaying it.
Arrow Functions are an compact alternative to the traditional Functions. It has some differences in the syntax and has limitations.
I have taken the above code from Programming Assignment 2, from lines 80-95. In this code, I am making an arror function named 'decision1' which has no parameters. In the function, if the userInput is not a part of the array, I am asking the user if they would want to add their input to the array. I am them manipulating the string to make it all upper case and removing any extra whitespace present in the end of the string. I am also running an error check with the help of a while loop which is seeing if the user input is a string or not. If the user enters any other variable, it will keep asking the user for input until the user enters a string. This was of error checking can be done if, for some reason, the conventional way of error checking, i.e., try and catch doesn't work.
Function Documentation is the written information of a function which includes the description of the function, a description of the parameters and return values, along with their datatypes.
Since my function documentation was not properly done in my asssignments, I have written a different code for this. This block of code can be 'script.js', from lines 11-46. In this code the top part is the function documentation. You can see that I have included the information of my parameters and return values. This information contains the name of the parameter or return value, their description and their datatype. The main purpose of the function is too identify the type of word entered by the user in the parameter 'userInput'.
Arrays are like variables but with multiple values, but all the values must have the same values. Arrays can be modified by using Array functions.
I have taken the above code from Programming Assignment 2, from lines 17-23. In this code, I am declaring an array 'habitats' which as four string values, i.e., "SAVANNAS", "FLOODPLAIN FORESTS", "GRASSLANDS", "SWAMPS". I am then sorting the array by using the '.sort()' array function. To print the array, I am using a for loop. The for loop will go over each index in the sorted array and print them in alphabetical order.
JSON stand for JavaScript Object-Notation. It is one of two ways to make an object in JavaScript. They are like arrays but can have different data types.
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