Typescript - multidimensional array initialization

Question

I m playing with Typescript and I wonder  how to properly instantiate and declare multidimensional array  Here s my code   class Something       private things  Thing           constructor             things             how instantiate object              for var i  number   0  i  lt  10  i                  this things i    new Thing          how instantiate 1st level                 for var j  number   0  j lt  10  j                      this things i  j    new Thing          how instantiate 2nd lvl item                                       Can you give me any hint about selected places

User · Answer

If you want to do it typed   class Something      areas  Area         constructor         this areas   new Array lt Array lt Area gt  gt         for  let y   0  y  lt   100  y            let row Area      new Array lt Area gt                 for  let x   0  x  lt  100  x             row push new Area x  y                  this areas push row

User · Answer

You only need    to instantiate an array - this is true regardless of its type  The fact that the array is of an array type is immaterial   The same thing applies at the first level in your loop  It is merely an array and    is a new empty array - job done   As for the second level  if Thing is a class then new Thing   will be just fine  Otherwise  depending on the type  you may need a factory function or other expression to create one   class Something       private things  Thing           constructor             this things                for var i  number   0  i  lt  10  i                  this things i                    for var j  number   0  j lt  10  j                      this things i  j    new Thing

User · Answer

You can do the following  which I find trivial  but its actually correct   For anyone trying to find how to initialize a two-dimensional array in TypeScript  like myself   Let s assume that you want to initialize a two-dimensional array  of any type  You can do the following const myArray  any           And later  when you want to populate it  you can do the following  myArray push   lt your value goes here gt     A short example of the above can be the following  const myArray  string           myArray push   quot value1 quot    quot value2 quot

User · Answer

Beware of the use of push method  if you don t use indexes  it won t work   var main2dArray  Things           main2dArray push someTmp1dArray  main2dArray push someOtherTmp1dArray    gives only a 1 line array   use   main2dArray 0    someTmp1dArray main2dArray 1    someOtherTmp1dArray   to get your 2d array working      Other beware  foreach doesn t seem to work with 2d arrays

User · Answer

Here is an example of initializing a boolean      const n   8     or some dynamic value const palindrome  boolean       new Array n                                      fill false                                      map      gt  new Array n                                      fill false

[multidimensional-array] Typescript - multidimensional array initialization

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