Attached, you find the source code for this section. The snapshots are also attached to individual lectures throughout this module (i.e. the lectures to which each snapshot belongs).
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The following resources may be helpful.
Please keep in mind that this course is structured differently and builds up knowledge step by step - the linked articles don't necessarily do that and hence can easily be overwhelming. So going through them is optional and neither required nor necessarily recommended at this point of time:
MDN => JavaScript Basics: https://developer.mozilla.org/en-US/docs/Web/JavaScript
MDN => Variables: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/First_steps/Variables
MDN => Operators: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/First_steps/Math
MDN => Functions: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Building_blocks/Functions
MDN => Arrays: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/First_steps/Arrays
MDN => Objects: https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Basics