SHARE
TWEET

Untitled

WhiteofNotGrey Jun 8th, 2019 (edited) 79 Never
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
  1. /* String: Any form of text */
  2. /*Object: Stores a lot of key value pairs*/
  3.  
  4. /* declaring variables */
  5.  
  6. var  myName = "Beau"
  7. /*can be used throughout program*/
  8.  
  9. myName = 8
  10.  
  11. let ourName = "freeCodeCamp"
  12. /* may only be used within scope of where you declare that*/
  13.  
  14. const pi = 3.14
  15. /*can never change*/
  16.  
  17. var a;
  18. /* declaring a variable, called a */
  19.  
  20. var b =2;
  21. /*declaring a, assigning 2*/
  22.  
  23. a = 7;
  24. /* a has already been declared*/
  25.  
  26. b = a;
  27. /* you have assigned contents of a to b*/
  28.  
  29. /*initializing a variable to an inital value at the same time it's declared*/
  30. var a =9;
  31. /* a: declare, 9: initizing*/
  32.  
  33. /* adding/subtracting numbers */
  34. var sum = 10 + 10;
  35. console.log(sum)
  36.  
  37. var difference = 20 - 10;
  38.  
  39. var product = 8 * 10;
  40.  
  41. var quotient = 66/2;
  42.  
  43. /*Incrementing numbers*/
  44. /* refers to adding 1 to it*/
  45.  
  46. var myVar = 81;
  47.  
  48. myVar = myVar + 1;
  49.  
  50. /*or*/
  51.  
  52. myVar++;
  53.  
  54. /*decrementing numbers*/
  55. /* minus 1 to it*/
  56.  
  57. var dcVar = 11;
  58.  
  59. dcVar = dcVar - 1;
  60.  
  61. /*or*/
  62.  
  63. dcVar--;
  64.  
  65. /*decimal numbers*/
  66.  
  67. var myDecimal = 5.7;
  68.  
  69. var secondDecimal = 0.0007;
  70.  
  71. /*Multiplying decimals*/
  72.  
  73. var product = 2.0 * 2.5;
  74. console.log(product)
  75.  
  76. /*Dividing decimals*/
  77.  
  78. var quotient = 6.4/2.0;
  79.  
  80. /*finding the remainder*/
  81. var remainder;
  82. remainder = 11 % 3;
  83.  
  84. 1821
  85.  
  86. ////////
  87. Variables are used to store data temporarily
  88.  
  89. - Data is stored somewhere, and give that memory location a name
  90.  
  91. - With this name, you may read the data and at a given location
  92.  
  93. A variable = box
  94.  
  95. What's inside the box = Value that we assign to variable (data)
  96.  
  97. Strings are a sequence of characters.
  98.  
  99.  
  100.  
  101. Rules of naming variables
  102.  
  103. - Do not use prexisting keywords used already
  104. - Meaningful, should be clear instead of a1, b and c
  105. - cannot start with a number (1name etc)
  106. - cannot contain space or hyphen (-)
  107. - case sensitive
  108.  
  109. To declare multiple variables
  110.  
  111. let firstName = "NumberOne";
  112. let lastName = "NumberTwo";
  113.  
  114.  
  115. value of variables (let) can change, but
  116. the value of a constant cannot.
  117.  
  118.  
  119. If you don't need to reassign, constant should be used.
  120. If you do, use let
  121.  
  122. undefined: if value is not initalized, by default, its value is undefined
  123. null is used to clear value of variable
RAW Paste Data
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. OK, I Understand
Top