just some definitions and notes.

• JS strings are immutable, means that they cannot be altered once created.

JS objects

• it has properties and methods.
• you can access a prop by dot '.' --> obj.name ..... or by a brackets --> obj["name"] this one with the spaced props.
• to delete a prop .. delete obj.prop
• obj.hasOwnProperty() -> check out if it has this prop.
• access many nasted obj -> obj1.objNasted1.objNasted2["prop"].
• Math.floor(Math.random()*x) random between 0 , x
• regEx : - /exp/gi ...... global ignore line ........ - /\d++/g 3 digits ....\f \n \s \S