Javascript 在 TypeScript 中声明一个数组
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Declare an array in TypeScript
提问by Nitzan Tomer
I'm having trouble either declaring or using a boolean array in Typescript, not sure which is wrong. I get an undefinederror. Am I supposed to use JavaScript syntax or declare a new Array object?
我在 Typescript 中声明或使用布尔数组时遇到问题，不确定哪个是错误的。我收到一个undefined错误。我应该使用 JavaScript 语法还是声明一个新的 Array 对象？
Which one of these is the correct way to create the array?
以下哪一种是创建数组的正确方法？
private columns = boolean[];
private columns = [];
private columns = new Array<boolean>();
How would I initialize all the values to be false?
我将如何将所有值初始化为 false？
How would I access the values, can I access them like, columns[i] = true;..?
我将如何访问这些值，我可以像columns[i] = true;……一样访问它们吗？
回答by Nitzan Tomer
Here are the different ways in which you can create an array of booleans in typescript:
以下是在打字稿中创建布尔数组的不同方法：
let arr1: boolean[] = [];
let arr2: boolean[] = new Array();
let arr3: boolean[] = Array();
let arr4: Array<boolean> = [];
let arr5: Array<boolean> = new Array();
let arr6: Array<boolean> = Array();
let arr7 = [] as boolean[];
let arr8 = new Array() as Array<boolean>;
let arr9 = Array() as boolean[];
let arr10 = <boolean[]> [];
let arr11 = <Array<boolean>> new Array();
let arr12 = <boolean[]> Array();
let arr13 = new Array<boolean>();
let arr14 = Array<boolean>();
You can access them using the index:
您可以使用索引访问它们：
console.log(arr[5]);
and you add elements using push:
然后使用 push 添加元素：
arr.push(true);
When creating the array you can supply the initial values:
创建数组时，您可以提供初始值：
let arr1: boolean[] = [true, false];
let arr2: boolean[] = new Array(true, false);
回答by Kayani
this is how you can create an array of boolean in TS and initialize it with false:
这是在 TS 中创建布尔数组并用 false 初始化它的方法：
var array: boolean[] = [false, false, false]
or another approach can be:
或另一种方法可以是：
var array2: Array<boolean> =[false, false, false]
you can specify the type after the colon which in this case is boolean array
您可以在冒号后指定类型，在这种情况下是布尔数组
回答by Mark Macneil Bikeio
Specific type of array in typescript
打字稿中特定类型的数组
export class RegisterFormComponent
{
genders = new Array<GenderType>(); // Use any array supports different kind objects
loadGenders()
{
this.genders.push({name: "Male",isoCode: 1});
this.genders.push({name: "FeMale",isoCode: 2});
}
}
type GenderType = { name: string, isoCode: number }; // Specified format
回答by snehal badhe
let arr1: boolean[] = [];
console.log(arr1[1]);
arr1.push(true);
回答by Arghya C
One way of declaring a typed array in TypeScriptis
声明类型化数组的一种方法TypeScript是
const booleans = new Array<Boolean>();
// or, if you have values to initialize
const booleans: Array<Boolean> = [true, false, true];
const valFalse = booleans[1];
