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Steve's JS Cheat Sheet (DRAFT) by

JS for Beginners Cheat Sheet

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Variables

var
let
const

Calling A Class

const varName = new classname(inputVars);

Template Literals

string text


string text ${expression} string text
Template literals are string literals allowing embedded expres­sions. You can use multi-line strings and string interp­olation features with them.
  

Creating Function

if ( what you're testing ) {
   what to do when true;
   } else {
  what to do when false;
  }
};

Create Iteration

for ( let singleObject in dataset) {
     code;
};
single object = would be the specific item in the data set
dataset = would be the entire data set

Create If, Then, Else

if ( what you're testing ) {
   what to do when true;
   } else {
    what to do when false;
  }
};

Creating Classes

 class className {
     constructor (inputVars) {
          //Input Variable Mapping 

          this._inputVar = var;
        }

       //Methods, Setters and Getters

       get methodName(inputVars) {
            code // e.g. return
       }

      methodName (inputVars) {
          code // e.g. return
     } 

};
* No comma between items inside classes

Extending a Class

class newClass extends parentClass {
     constructor (inputVars) {
          super(inputVar)) // calls the parent class
          this.inputVar = var //creates a subclass specific variable 
     }
};
You must always call the super method before you can use the this keyword — if you do not, JavaScript will throw a reference error. To avoid reference errors, it is best practice to call super on the first line of subclass constr­uctors.