角度转换数组到字符串

Question

我有以下数组（testArray），我希望将所有状态提取到字符串（'亚利桑那'，'阿拉斯加'，'佛罗里达'，'夏威夷'，'古吉拉特'，'果阿'，'旁遮普'......） 。有没有更简单的方法呢？

let testArray: State[];
testArray = this.getStates();

getStates() {
 return [
  new State(1, 1, 'Arizona'),
  new State(2, 1, 'Alaska'),
  new State(3, 1, 'Florida'),
  new State(4, 1, 'Hawaii'),
  new State(5, 2, 'Gujarat'),
  new State(6, 2, 'Goa'),
  new State(7, 2, 'Punjab'),
  new State(8, 3, 'Queensland'),
  new State(9, 3, 'South Australia'),
  new State(10, 3, 'Tasmania'),
  new State(11, 4, 'Penang')
 ];
}

Answer 1

最简单的方法如下

getStates().map(x=>x.StateName).join(",")

实例如下

function State(id,val,StateName) {
  this.id = id;
  this.val = val;
  this.StateName = StateName;
}

function getStates() {
 return [
  new State(1, 1, 'Arizona'),
  new State(2, 1, 'Alaska'),
  new State(3, 1, 'Florida'),
  new State(4, 1, 'Hawaii'),
  new State(5, 2, 'Gujarat'),
  new State(6, 2, 'Goa'),
  new State(7, 2, 'Punjab'),
  new State(8, 3, 'Queensland'),
  new State(9, 3, 'South Australia'),
  new State(10, 3, 'Tasmania'),
  new State(11, 4, 'Penang')
 ];
}

//Simplest Way is as follows
console.log(getStates().map(x=>x.StateName).join(","))

Answer 2

使用reduce的另一种解决方案。

getStates().reduce((current, value, index) => {
    if(index > 0)
        current += ',';

    return current + value.StateName;
}, '');

作为一个完整的片段：

function State(id,val,StateName) {
  this.id = id;
  this.val = val;
  this.StateName = StateName;
}

function getStates() {
 return [
  new State(1, 1, 'Arizona'),
  new State(2, 1, 'Alaska'),
  new State(3, 1, 'Florida'),
  new State(4, 1, 'Hawaii'),
  new State(5, 2, 'Gujarat'),
  new State(6, 2, 'Goa'),
  new State(7, 2, 'Punjab'),
  new State(8, 3, 'Queensland'),
  new State(9, 3, 'South Australia'),
  new State(10, 3, 'Tasmania'),
  new State(11, 4, 'Penang')
 ];
}

var merged = getStates().reduce((current, value, index) => {
    if(index > 0)
        current += ',';

    return current + value.StateName;
}, '');

console.log(merged);