scala学习6--collection

 list的下标访问

var t = List(1,2,3,5,5)
println(t(2))

map函数

println(t.map(a=> {print("***"+a); a+2}));

添加元素

var t2 = t.+:("test")
println(6::t2)

foreach

t2.foreach(t=>print(t))

去重

t.distinct

累加

println(t./:(100)({
(sum,num)=>print(sum+"--"+num+" ");
	sum-num
}));

reduce

println(t.reduce(_-_))

元组：

var tuple01 = (1,5,6,6);
println(tuple01._1)
println(tuple01._4)

map：

var m1 =  Map[String,Int](("a" , 1), ("b" , 2));
println(m1("a"));
m1 += ("c" -> 3);
println(m1)
m1.foreach(a=>{
　　println(a+" "+a._1+" "+a._2)
});
m1.keys.foreach(b=>println(m1(b) = 2));
println(m1)