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Introduction
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HTML Elements and structure
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HTML Headings and Paragraphs
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HTML Lists and Tables
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HTML Forms and Input Fields
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HTML Images and Media
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HTML Links and Anchors
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HTML Styles and Formatting
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HTML Semantic Elements
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HTML Attributes
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HTML JavaScript Integration
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HTML Document and Browser Support
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HTML5 New Elements and Attributes
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HTML Accessibility and Web Standards
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HTML Responsive Design and Mobile Devices.
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Introduction
Data Structure Page 1
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Data Structure Page 3
Data Structure Page 4
Data Structure Page 5
Data Structure Page 6
Data Structure Page 7
Data Structure Page 8
String
Data Structure Page 9
Data Structure Page 10
Data Structure Page 11
Data Structure Page 12
Data Structure Page 13
Array
Data Structure Page 14
Data Structure Page 15
Data Structure Page 16
Data Structure Page 17
Data Structure Page 18
Linked List
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Data Structure Page 20
Stack
Data Structure Page 21
Data Structure Page 22
Queue
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Data Structure Page 24
Tree
Data Structure Page 25
Data Structure Page 26
Binary Tree
Data Structure Page 27
Data Structure Page 28
Heap
Data Structure Page 29
Data Structure Page 30
Graph
Data Structure Page 31
Data Structure Page 32
Searching Sorting
Data Structure Page 33
Hashing Collision
Data Structure Page 35
Data Structure Page 36
JAVASCRIPT
- Question 21
What is type coercion in JavaScript and give an example?
- Answer
In JavaScript, type coercion refers to the automatic conversion of one data type to another when performing operations. It occurs when you use operators or functions with operands of different types. JavaScript tries to make sense of the operation by converting the operands to a common type.
Type coercion can be categorized into two types: explicit and implicit coercion.
Explicit Coercion: Explicit coercion occurs when you intentionally convert a value from one type to another using built-in functions or operators. Examples include using functions like
Number()
,String()
, orBoolean()
to convert a value to a specific type.
var x = "10";
var y = 5;
var result = Number(x) + y;
console.log(result); // Output: 15
In the above example, the string value "10"
is explicitly coerced to a number using the Number()
function before performing addition with the variable y
.
Implicit Coercion: Implicit coercion happens when JavaScript automatically converts the type of a value during an operation. This can lead to unexpected results if you’re not aware of the coercion rules. Common examples include using the
+
operator for concatenation or addition and using the comparison operators.
var x = 10;
var y = "5";
var result = x + y;
console.log(result); // Output: "105"
In this case, the number 10
is implicitly coerced into a string because the other operand is a string. The +
operator performs concatenation, resulting in the string "105"
.
It’s important to be cautious when relying on implicit coercion as it can sometimes lead to code that is difficult to understand and debug. It’s generally recommended to use explicit coercion to ensure clarity and prevent unexpected behavior in your code.
- Question 22
Explain the difference between a string and a number in JavaScript?
- Answer
In JavaScript, a string is a data type that represents a sequence of characters, such as letters, numbers, or symbols. Strings are enclosed in single quotes ('
) or double quotes ("
). For example:
var myString = "Hello, world!";
In this case, "Hello, world!"
is a string.
On the other hand, a number in JavaScript represents numeric values. Numbers can be integers (whole numbers) or floating-point numbers (numbers with a decimal point). For example:
var myNumber = 42;
In this case, 42
is a number.
The main difference between strings and numbers in JavaScript is their inherent nature and the type of operations that can be performed on them.
Operations: Strings can be concatenated (joined together) using the
+
operator, which results in the concatenation of the characters. For example:
var str1 = "Hello";
var str2 = "world";
var result = str1 + ", " + str2;
console.log(result); // Output: "Hello, world"
Numbers, on the other hand, can undergo mathematical operations such as addition (+
), subtraction (-
), multiplication (*
), division (/
), and more. For example:
var num1 = 5;
var num2 = 7;
var sum = num1 + num2;
console.log(sum); // Output: 12
Coercion: As mentioned earlier, JavaScript allows for type coercion, where it automatically converts values of one type to another. For example, when you use the +
operator with a string and a number, JavaScript will implicitly coerce the number to a string and perform string concatenation. Example:
var str = "The answer is: ";
var num = 42;
var result = str + num;
console.log(result); // Output: "The answer is: 42"
In this case, the number 42
is implicitly coerced into a string and concatenated with the string "The answer is: "
.
It’s important to note that JavaScript provides functions like parseInt()
and parseFloat()
to explicitly convert strings to numbers and vice versa.
Overall, strings and numbers are distinct data types in JavaScript, and understanding their differences helps determine how they behave and the operations that can be performed on them.
- Question 23
How to perform type conversion in JavaScript?
- Answer
In JavaScript, you can perform type conversions using built-in functions or operators specifically designed for type conversion. Here are some common ways to convert between different types:
String to Number: To convert a string to a number, you can use the
parseInt()
orparseFloat()
functions.parseInt()
converts a string to an integer, whileparseFloat()
converts a string to a floating-point number.
var str = "42";
var num = parseInt(str);
console.log(num); // Output: 42
var floatStr = "3.14";
var floatNum = parseFloat(floatStr);
console.log(floatNum); // Output: 3.14
Number to String: To convert a number to a string, you can use the String()
function or the toString()
method of the number.
var num = 42;
var str = String(num);
console.log(str); // Output: "42"
var anotherNum = 3.14;
var strNum = anotherNum.toString();
console.log(strNum); // Output: "3.14"
Boolean to String or Number: To convert a boolean value to a string or number, you can use the
String()
orNumber()
functions. When convertingtrue
, it becomes"true"
or1
, respectively. When convertingfalse
, it becomes"false"
or0
, respectively.
var bool = true;
var str = String(bool);
console.log(str); // Output: "true"
var num = Number(bool);
console.log(num); // Output: 1
String to Boolean: To convert a string to a boolean value, you can use the Boolean()
function. It will return false
for an empty string (""
) or "0"
, and true
for any other non-empty string.
var str = "true";
var bool = Boolean(str);
console.log(bool); // Output: true
var emptyStr = "";
var boolEmpty = Boolean(emptyStr);
console.log(boolEmpty); // Output: false
These are just a few examples of type conversion in JavaScript. Remember to choose the appropriate conversion method based on the desired outcome and the specific data types involved.
- Question 24
What is the difference between primitive and non-primitive data types in JavaScript?
- Answer
In JavaScript, data types are divided into two main categories: primitive and non-primitive (also known as reference types). The main differences between these two categories are their behavior, storage, and mutability. Let’s explore each of them:
Primitive Data Types: Primitive data types are immutable and directly store their values. There are six primitive data types in JavaScript:
Number: Represents numeric values, including integers and floating-point numbers.
String: Represents a sequence of characters enclosed in single quotes (
'
) or double quotes ("
).Boolean: Represents a logical value, either
true
orfalse
.Undefined: Represents a variable that has been declared but has not been assigned a value.
Null: Represents the intentional absence of any object value.
Symbol: Represents a unique identifier, introduced in ECMAScript 6.
Primitive values are compared by their value. When you assign a primitive value to a variable or pass it as a function argument, a copy of the value is created.
var x = 5;
var y = x; // y receives a copy of the value in x
x = 10;
console.log(y); // Output: 5
Non-Primitive (Reference) Data Types: Non-primitive data types do not store the actual value directly. Instead, they store references (memory addresses) that point to the location in memory where the value is stored. There are three non-primitive data types in JavaScript:
Object: Represents a collection of key-value pairs, arrays, functions, and more.
Array: Represents an ordered list of values.
Function: Represents a reusable block of code that can be invoked.
Non-primitive values are compared by reference. When you assign a non-primitive value to a variable or pass it as a function argument, the reference to the value is copied, not the actual value itself.
var obj1 = { name: "John" };
var obj2 = obj1; // obj2 receives a reference to the same object as obj1
obj1.name = "Jane";
console.log(obj2.name); // Output: "Jane"
In the above example, changing the name
property of obj1
also affects obj2
because they both refer to the same object.
Non-primitive values can be mutated by modifying the referenced object’s properties or elements. However, the reference itself remains unchanged.
Understanding the differences between primitive and non-primitive data types is important for correctly handling and manipulating values in JavaScript.
- Question 25
What is the use of parseInt() and parseFloat() in JavaScript?
- Answer
The parseInt()
and parseFloat()
functions in JavaScript are used for parsing and converting strings to numbers.
parseInt(): The
parseInt()
function is primarily used to convert a string to an integer (a whole number). It takes two parameters: the string to be parsed and an optional radix parameter that specifies the base of the number system to be used for parsing (default is base 10). The function starts parsing from the beginning of the string until it encounters a non-numeric character, at which point it stops and returns the parsed integer value.
var numStr = "42";
var num = parseInt(numStr);
console.log(num); // Output: 42
var hexStr = "FF";
var hexNum = parseInt(hexStr, 16);
console.log(hexNum); // Output: 255
In the above example, parseInt()
converts the string "42"
to the integer 42
. The second example demonstrates parsing a hexadecimal string "FF"
using a radix of 16
, resulting in the decimal value 255
.
parseFloat(): The parseFloat()
function is used to convert a string to a floating-point number (a number with decimal places). It works similarly to parseInt()
, but it allows for parsing and conversion of floating-point numbers.
var floatStr = "3.14";
var floatNum = parseFloat(floatStr);
console.log(floatNum); // Output: 3.14
var scientificNotation = "6.02e23";
var scientificNum = parseFloat(scientificNotation);
console.log(scientificNum); // Output: 6.02e+23
In the above example, parseFloat()
converts the string "3.14"
to the floating-point number 3.14
. The second example demonstrates parsing a string with scientific notation ("6.02e23"
) into the corresponding floating-point number.
Both parseInt()
and parseFloat()
functions provide the capability to extract numerical values from strings, making them useful when dealing with user input, parsing numeric data from APIs, or performing calculations that involve string representations of numbers.
It’s important to note that if the string cannot be parsed into a valid number, both functions will return NaN
(Not a Number). Therefore, it’s always a good practice to handle potential parsing errors and validate the resulting parsed values accordingly.
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Introduction
Html page 1
Html page 2
Html page3
Html page4
HTML Elements and structure
Html page 5
Html page 6
Html page 7
HTML Headings and Paragraphs
Html page 8
Html page 9
Html page 10
HTML Lists and Tables
Html page 11
Html page 12
Html page 13
HTML Forms and Input Fields
Html page 14
Html page 15
Html page 16
HTML Images and Media
Html page 17
Html page 18
HTML Links and Anchors
Html page 19
Html page 20
Html page 21
HTML Styles and Formatting
Html page 22
HTML Semantic Elements
Html page 23
Html page 24
HTML Attributes
Html page 25
Html page 26
HTML JavaScript Integration
Html page 27
Html page 28
Html page 29
Html page 30
HTML Document and Browser Support
Html page 31
Html page 32
HTML5 New Elements and Attributes
Html page 33
Html page 34
Html page 35
Html page 36
HTML Accessibility and Web Standards
Html page 37
Html page 38
Html page 39
HTML Responsive Design and Mobile Devices.
Html page 40
Html page 41
Html page 42
Introduction
Data Structure Page 1
Data Structure Page 2
Data Structure Page 3
Data Structure Page 4
Data Structure Page 5
Data Structure Page 6
Data Structure Page 7
Data Structure Page 8
String
Data Structure Page 9
Data Structure Page 10
Data Structure Page 11
Data Structure Page 12
Data Structure Page 13
Array
Data Structure Page 14
Data Structure Page 15
Data Structure Page 16
Data Structure Page 17
Data Structure Page 18
Linked List
Data Structure Page 19
Data Structure Page 20
Stack
Data Structure Page 21
Data Structure Page 22
Queue
Data Structure Page 23
Data Structure Page 24
Tree
Data Structure Page 25
Data Structure Page 26
Binary Tree
Data Structure Page 27
Data Structure Page 28
Heap
Data Structure Page 29
Data Structure Page 30
Graph
Data Structure Page 31
Data Structure Page 32
Searching Sorting
Data Structure Page 33
Hashing Collision
Data Structure Page 35
Data Structure Page 36