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Questions and Answers
What will the output of the following code be: document.write("Sum: " + (a+b)); if a = 2 and b = 5?
What will the output of the following code be: document.write("Sum: " + (a+b)); if a = 2 and b = 5?
- Sum: 7 (correct)
- Sum: 12
- Sum: 5
- Sum: 10
Which operator is used to assign a value to a variable in JavaScript?
Which operator is used to assign a value to a variable in JavaScript?
- = (correct)
- ===
- ==
- !=
What is the significance of the '===' operator compared to '=='?
What is the significance of the '===' operator compared to '=='?
- It checks if values are equal, ignoring data type.
- It checks if values and data types are both equal. (correct)
- It checks if values are not equal, ignoring data type.
- It checks only the data type of the values.
If variable e is defined as var e = (75 == 100), what will be the value of e?
If variable e is defined as var e = (75 == 100), what will be the value of e?
What does the '!==' operator do in JavaScript?
What does the '!==' operator do in JavaScript?
Why is the String Operator (+) important in JavaScript?
Why is the String Operator (+) important in JavaScript?
In an if statement, what happens if the condition is false?
In an if statement, what happens if the condition is false?
What will the output of document.write(!(e)); be if e is false?
What will the output of document.write(!(e)); be if e is false?
Flashcards
Operator
Operator
A special symbol in JavaScript used to perform operations on values.
Arithmetic Operator
Arithmetic Operator
Used to perform mathematical operations like addition, subtraction, multiplication, etc.
Assignment Operator
Assignment Operator
Used to assign values to variables.
Comparison Operator
Comparison Operator
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String Operator
String Operator
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If statement
If statement
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Else statement
Else statement
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Loop
Loop
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Study Notes
JavaScript Operators
- Operators are special symbols that perform operations on variables and values.
- Arithmetic Operators: Used for mathematical operations (addition, subtraction, multiplication, division, modulus, exponentiation).
- Example:
5 + 2 = 7,4 - 2 = 2,2 * 3 = 6,4 / 2 = 2,5 % 2 = 1,4 ** 2 = 16
- Example:
- Assignment Operators: Used to assign values to variables.
- Example:
a = 7,a += 1(equivalent toa = a + 1),a -= 3(equivalent toa = a - 3),a *= 4(equivalent toa = a * 4),a /= 3(equivalent toa = a / 3),a %= 10(equivalent toa = a % 10).
- Example:
- Comparison Operators: Compare two values/variables and return a boolean result (true or false).
==(equal to),===(strictly equal to),!=(not equal to),!==(strictly not equal to),>(greater than),<(less than),>=(greater than or equal to),<=(less than or equal to).- Note:
==and!=do not consider data types (e.g.,3 == "3"istrue). - Note:
===and!==strictly consider data types (e.g.,3 === "3"isfalse).
- Logical Operators: Compare two or more comparisons and return a boolean result.
&&(and),||(or),!(not).- Example:
(16 == "16") && ("car" != "caR")istrue.
- String Operator: Used to link two or more string values together.
- Example:
"My name is " + "Miguel"results in"My name is Miguel".
- Example:
JavaScript Conditional Statements
ifstatement: Executes a block of code if a condition is true.- Example flowchart shown.
elsestatement: Executes a block of code if theifcondition is false.- Example flowchart shown.
else ifstatement: Specifies a new condition if the previousiforelse ifconditions are false.- Example flowchart shown.
Additional JavaScript Methods
confirm(): Displays a dialog box asking the user to verify an action with "Yes" or "No."prompt(): Displays a dialog box asking the user to input a value.
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