Conditional Constructs in Javascript
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Understanding conditional constructs in Javascript. As a part of programming fundamentals it is important to understand the basic conditional checks including the various operators used for the same.
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Conditional Constructs in Javascript
- 2. Conditional Constructs • Different situations Different solutions • Complex problem Multiple possible solutions
- 3. Problem with problems • Finding the best fit solution for each problem • Check different permutations and combinations
- 4. IF • If a particular condition is true -> perform a specific action • Eg: – if (fruit == "apple") fruit_color = "Red";
- 5. If-else • If a particular condition is true -> perform a specific action otherwise perform next action • Eg: – if(fruit == "apple") fruit_color = "Red"; else fruit_color = "Orange";
- 6. If-elseif-else • If a particular condition is true -> perform a specific action • Otherwise check another condition, if true perform that specific action • If none of above conditions is true perform a specific action • Eg: if(fruit=="red_apple") fruit_color = "red"; elseif (fruit=="green_apple") fruit_color="green"; else fruit_color="orange";
- 7. Using Operators • Check a specific condition • Analyse the problem • Find the best fit solution by checking multiple conditions simulaneously • Form relationship between different conditions to be analysed • Do arithmetic calculations
- 10. Assignment Operator • = • Assign a value to a variable/constant/array • Value on the RHS is assigned to the storage on LHS • Eg: apples_bunch = 12; PI = 3.14; fruit = "apple";
- 12. Relational Operator • Form relationship between two conditions • Compare the values of parameters
- 13. Relational • To make a comparison while checking a condition, use relational operators. Operator Functionality Let’s consider x=5; y=10; > More Than x>y; False < Less Than x<y; True >= More Than or Equal To x>=y; False <= Less Than or Equal To x<=y; True == Equal to x==y; False != Not Equal to x!=y; True
- 14. IF • If a particular condition is true -> perform a specific action • Eg: if (fruit == 'apple') fruit_color = 'Red';
- 15. LOGICAL OPERATOR &&, ||, !
- 16. Logical Operator • Form relationship between multiple conditions • Also known as combinational operator – Combines different conditions together to find solution – AND- && – OR- || – NOT- !
- 17. Logical • To combine two or more situations of conditional checking use, logical operators. Operator Functionality Condition Example && Both the sides of operator should result true x<y && y!=x True x<y && y==x False || Either side of operator should result true x<y || y!=x True x<y || y!=x True ! Inverse the result x!<y False
- 18. If-else • Checking multiple conditions and parameter values. • Eg: if(fruit == "apple" && fruit_color == "red") fruit = "Red Apple"; else fruit = 'Orange';
- 19. If-elseif-else • Checking multiple conditions • Eg: if(fruit=="apple" && fruit_color == "red") fruit = "Red Apple"; elseif (fruit=="apple" && fruit_color == "green") fruit = "Green Apple"; else fruit = "Orange";
- 21. Arithmetic • To compute arithmetic value we use Arithmetic Operators. Operator Functionality Condition Example + Addition x+y 15 - Subtraction x-y -5 * Multiplication x*y 50 / Division x/y 0 % Remainder x%y 5
- 22. Arithmetic Function • Eg: if(fruit=="apple" && fruit_color == "red") red_apple = red_apple+1; elseif (fruit=="apple" && fruit_color == "green") green_apple = green_apple+1; else orange = orange+1;
- 24. Unary Operator • Works with a single operand • There is no RHS (Right hand side) to the condition • Performing certain operations with a shorthand
- 25. Unary Operators • Used with single operand Operator Functionality Condition Example + Positive Value X= +15 - Negative Value X= -5 ++ Increment X++ or ++X -- Decrement X-- or --X ! NOT !x
- 26. Conditional Constructs and Operators used in Javascript https://www.codewizacademy.com https://www.facebook.com/codewizacademy/ https://www.instagram.com/codewizacademy/