// collections.groovy — lists, maps and ranges with Groovy syntax.

// Lists: [] creates an ArrayList
def skus = ['AX-200', 'BX-310']
skus << 'CX-420'                          // append
skus += 'DX-530'
println skus                              // [AX-200, BX-310, CX-420, DX-530]
println skus[0] + ' ' + skus[-1]          // first and last
println skus[1..2]                        // [BX-310, CX-420]
println skus.size()
println 'BX-310' in skus                  // true
println([3, 1, 2].sort())                 // [1, 2, 3]
println([1, 2, 2, 3].unique())            // [1, 2, 3]
println([1, 2, 3] - [2])                  // [1, 3]

// Maps: [key: value] creates a LinkedHashMap (keeps insertion order)
def stock = ['AX-200': 12, 'BX-310': 0]
stock['CX-420'] = 7                       // add
stock.'DX-530' = 3                        // property-style access
println stock                             // [AX-200:12, BX-310:0, CX-420:7, DX-530:3]
println stock['AX-200']                   // 12
println stock.get('ZZ-999', 0)            // 0 (and stores it)

def order = [id: 'PO-4471', customer: 'Acme', lines: 3]   // simple keys need no quotes
println order.customer                    // Acme
order.each { key, value -> println "$key -> $value" }

// Ranges
def range = 1..5
println range.toList()                    // [1, 2, 3, 4, 5]
println((1..<5).toList())                 // [1, 2, 3, 4]  (exclusive end)
println(('a'..'e').join(''))              // abcde
for (i in 1..3) print "$i "
println()

// Nested data, like JSON
def payload = [orders: [[id: 'PO-1', total: 250], [id: 'PO-2', total: 90]]]
println payload.orders*.id                // [PO-1, PO-2]  (spread operator)
println payload.orders.total.sum()        // 340