Declare an array in TypeScript

Question

I m having trouble either declaring or using a boolean array in Typescript  not sure which is wrong  I get an undefined error  Am I supposed to use JavaScript syntax or declare a new Array object    Which one of these is the correct way to create the array   private columns   boolean    private columns       private columns   new Array lt boolean gt       How would I initialize all the values to be false   How would I access the values  can I access them like  columns i    true

User · Answer

this is how you can create an array of boolean in TS and initialize it with false:

var array: boolean[] = [false, false, false]

or another approach can be:

var array2: Array<boolean> =[false, false, false]

you can specify the type after the colon which in this case is boolean array

User · Answer

let arr1  boolean          console log arr1 1     arr1 push true

User · Answer

Specific type of array in typescript  export class RegisterFormComponent         genders   new Array lt GenderType gt          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

User · Answer

Here are the different ways in which you can create an array of booleans in typescript   let arr1  boolean         let arr2  boolean     new Array    let arr3  boolean     Array     let arr4  Array lt boolean gt        let arr5  Array lt boolean gt    new Array    let arr6  Array lt boolean gt    Array     let arr7      as boolean    let arr8   new Array   as Array lt boolean gt   let arr9   Array   as boolean     let arr10    lt boolean   gt      let arr11    lt Array lt boolean gt  gt  new Array    let arr12    lt boolean   gt  Array     let arr13   new Array lt boolean gt     let arr14   Array lt boolean gt       You can access them using the index   console log arr 5      and you add elements using push   arr push true     When creating the array you can supply the initial values   let arr1  boolean      true  false   let arr2  boolean     new Array true  false

User · Answer

Few ways of declaring a typed array in TypeScript are const booleans  Array lt boolean gt    new Array lt boolean gt        OR  JS like type and initialization const booleans  boolean             or  if you have values to initialize  const booleans  Array lt boolean gt     true  false  true      get a vaue from that array normally const valFalse   booleans 1

[javascript] Declare an array in TypeScript

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