JavaFX Sequence

Sequence を宣言する
sequence の要素を item という

var weekDays = ["Mon","Tue","Wed","Thu","Fri"];

コンパイラは item から型を判断する。上記の場合コンパイラは
String と判断する

型を明記することもできる

var weekDays: String[] = ["Mon","Tue","Wed","Thu","Fri"];

他のsequence を使って宣言することができる

var days = [weekDays, ["Sat","Sun"]];
// var = ["Mon","Tue","Wed","Thu","Fri","Sat","Sun"]

1 から 100 までの item の sequence を簡単に作ることが出来る

var nums = [1..100];

条件式を使って item を選択することができる

var nums = [1,2,3,4,5];
 
var numsGreaterThanTwo = nums[n | n > 2];
// numsGreaterThanTwo = [3,4,5]

sequence の長さは sizeof で得られる

var days = ["Mon","Tue","Wed","Thu","Fri","Sat","Sun"];
println(sizeof days);
// 7

item を追加するには insert を使う

var days = ["Mon"];
insert "Tue" into days;
insert "Fri" into days;
insert "Sat" into days;
insert "Sun" into days;
// days = ["Mon","Tue","Fri","Sat","Sun"]

位置を指定して追加することができる

insert "Thu" before days[2];
insert "wed" after days[1];

item を削除するには delete を使う

delete "Sun" from days;
delete days[0];
delete days;     // delete all items

item の順番を逆にするには reverse を使う

var nums = [1..5];
reverse nums; // returns [5, 4, 3, 2, 1]

sequence を比較することができる
2つの sequence の長さが同じで、item が同じとき
2つの sequence は等しいと判断される

var seq1 = [1,2,3,4,5];
var seq2 = [1,2,3,4,5];
println(seq1 == seq2);  // true

var seq1 = [1,2,3,4,5];
var seq2 = [1,2,3,4,5,6];
println(seq1 == seq2);  // false

var seq1 = [1,2,3,4,5];
var seq2 = [1,3,2,4,5];
println(seq1 == seq2);  // false

sequence を slice して新しい sequence を作ることができる

seq[a..b]

var days = ["Mon","Tue","Wed","Thu","Fri","Sat","Sun"];
var weekend = days[5..6];   // weekend = ["Sat","Sun"]

seq[a..< b]

var days = ["Mon","Tue","Wed","Thu","Fri","Sat","Sun"];
var weekdays = days[0..<5];
// weekend = ["Mon","Tue","Wed","Thu","Fri"]

seq[a..]

var days = ["Mon","Tue","Wed","Thu","Fri","Sat","Sun"];
var weekend = days[5..];  // weekend = ["Sat","Sun"]

seq[a..<]

var days = ["Mon","Tue","Wed","Thu","Fri","Sat","Sun"];
var days2 = days[0..<];
//  var = ["Mon","Tue","Wed","Thu","Fri","Sat"]