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JavaScript Lessons
Eight short lessons covering how JavaScript selects page elements, stores data, makes decisions, repeats actions, and responds to what users do.
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Lessons List
1
Document Object Model (DOM)Finding and changing page elements: getElementById, querySelector, innerHTML and appendChild.
2
DeclarationComments, let, const and var, and the String, Number, Boolean and Array types.
3
Control FlowMaking decisions with if, else if, else and switch.
4
LoopsRepeating code with for, while, do...while and for...of, and stopping with break.
5
FunctionsReusable blocks of code with function, parameters and return.
6
ObjectsGrouping related values in objects, and reading and changing their properties.
7
Built-in ObjectsReady-made tools: String, Number, Array, Date, Math, Math.random() and Boolean.
8
EventsReacting to clicks, hovers and typing with onclick, onmouseover and onkeyup.