Creating Arrays

• [] -- var a = [] -- creates an empty array
• [n m] -- var a = [n, m] -- creates an array with n and m

Getting Length of Array

• a.length -- gets the length of array a

Accessing Elements

• use a[i] syntax for accessing elements where a is an Array and i is an integer
• offsets start at zero -- 0 corresponds to the 1st element and a.length - 1 is last element

const c = cube({ center: true });
const a = [c.translate([2, 0, 0]), c.translate([4, 0, 0]), c.translate([6, 0, 0])];
return a[0];

Accessing all elements

• use the array as arguments -- union(a) unions all elements of a

const c = cube({ center: true });
const a = [c.translate([2, 0, 0]), c.translate([4, 0, 0]), c.translate([6, 0, 0])];
return union(a);

Adding to arrays

• we can treat an array as a list of elements
• push -- a.push(o) -- adds an element to the end of the array

const c = cube({ center: true });
const a = [];
a.push(c.translate([2, 0, 0]));
a.push(c.translate([4, 0, 0]));
return union(a);

Setting Elements

• use a[i] = v syntax for setting elements where
  • a is an Array and i is an integer and v is a new value

var a = [33, 44];
a[0] = 99;
a == [99,44];

Homework

• create an array of shapes and union them
• create an array of two shapes and difference them with explicit array accesses
• create an array of two shapes and swap them using element setting