Storage in programming
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Variables, constants, and arrays are used to store data in JavaScript. Variables store single values that can change during a program, constants store single fixed values, and arrays store multiple values of the same type in indexed elements. Common data types stored include numbers, strings, Booleans, objects, and more. Proper naming conventions use camelCase for variables and arrays and ALL_CAPS for constants.
![Array
23 45 33 65 76 77
7 4 3 6
apple[0] apple[1] apple[2] apple[3] apple[4] apple[5]
INTR[0] INTR[1] INTR[2] INTR[3]
An array index always starts from 0. If we have an array of 10
elements, then the elements to be referred to will be 0-9. Here,
the length of array will be 10.
For example: Integer array of 6 elements for storing the price of 6 varieties of
apple.
var apple = new Array(6);
apple[0] = 23;……
Integer array of 4 elements for storing the interest rate of 4 bank products
eg. Fixed Deposit, Saving A/c, Current A/c, Recurring Deposit will be constant.
const INTR = new Array(4);](https://image.slidesharecdn.com/storageinprogramming-191018193837/85/Storage-in-programming-13-320.jpg)
Storage in programming
- 2. Kinds of Data • User generated data • Program Data User Inputs Storage var msg="Hello World" Program Data
- 3. User Generated Data Input User Generated Data Interact User Interaction Program Content
- 4. Program Data Data available beforehand Data processed via program
- 6. Variable • Named storage location in memory • By convention follow 'Camel Case' for naming Eg: – bigApple – usbMic • Value may change during program processing • Can hold a single value
- 7. Variable • Use word-let let message = "Hello World"; alert (message); let bigApple = 20; alert(bigApple); let user='Gauri', age= 20, message='Good Day'; alert(message + " "+user +" "+ age);
- 8. Constant • Named storage location in memory • By convention follow 'All Caps' for naming. Eg: – BIGAPPLE – USBMIC • Value may never change during program processing • Can hold a single value
- 9. Constant • Use word- const const piv = 3.14; window.alert("Value of pi: "+ piv);
- 10. Data Type • Data is any form of information • Number – Integer – Decimal • String – Combination of characters, integers and symbols • Boolean – Yes/No
- 11. Data Type • Null – Null value • Undefined – Variable or Constant that is not initialized • Object – Complex data structures • Symbol – Unique Identifiers
- 12. Array • Named storage location in memory • Can hold multiple values of same data type • By convention follow 'Camel Case' for a variable array name or 'All Caps' for a constant array name. Eg: – bigApple – usbMic • Name should be plural since array is collection of values. • Value of variable array may change during program processing • Value of constant array may change during program processing but cannot be reassigned
- 13. Array 23 45 33 65 76 77 7 4 3 6 apple[0] apple[1] apple[2] apple[3] apple[4] apple[5] INTR[0] INTR[1] INTR[2] INTR[3] An array index always starts from 0. If we have an array of 10 elements, then the elements to be referred to will be 0-9. Here, the length of array will be 10. For example: Integer array of 6 elements for storing the price of 6 varieties of apple. var apple = new Array(6); apple[0] = 23;…… Integer array of 4 elements for storing the interest rate of 4 bank products eg. Fixed Deposit, Saving A/c, Current A/c, Recurring Deposit will be constant. const INTR = new Array(4);
- 15. Difference Variables Constants Arrays Value may vary. Value can change once or multiple times via processing during the lifetime of program. Value remains constant. Cannot change through out the lifetime of program. Value may vary for each element individually during the lifetime of program. Stores single value Stores single value Stores multiple values depending on the length of array in different elements.
- 16. Storing data in JS https://www.codewizacademy.com https://www.facebook.com/codewizacademy/ https://www.instagram.com/codewizacademy/