javascript create empty array of a given size

Question

in javascript how would I create an empty array of a given size   Psuedo code   X   3  createarray myarray  X         output      myarray

User · Answer

Try using while loop  Array prototype push    var myArray       X   3  while  myArray length  lt  X      myArray push         Alternatively  using Array prototype fill    var myArray   Array 3  fill

User · Answer

We use Array from  length  500   since 2017

User · Answer

In 2018 and thenceforth we shall use     Array 500   to that end

User · Answer

You can use both javascript methods repeat   and split   together   quot   quot  repeat 10  split  quot   quot    This code will create an array that has 10 item and each item is empty string   x000D   x000D  const items       repeat 10  split       document getElementById  context   innerHTML   items map  item  index    gt  index   console log  items     items  x000D   lt pre id  context  gt    lt  pre gt  x000D   x000D   x000D

User · Answer

1  To create new array which  you cannot iterate over  you can use array constructor   Array 100  or new Array 100    2  You can create new array  which can be iterated over like below   a  All JavaScript versions   Array apply  Array apply null  Array 100     b  From ES6 JavaScript version   Destructuring operator      Array 100   Array prototype fill Array 100  fill undefined  Array from Array from   length  100      You can map over these arrays like below    Array 4  fill null  map  u  i    gt  i   0  1  2  3      Array 4   map  u  i    gt  i   0  1  2  3  Array apply null  Array 4   map  u  i    gt  i   0  1  2  3  Array from   length  4    map  u  i    gt  i   0  1  2  3

User · Answer

As of ES5  when this answer was given   If you want an empty array of undefined elements  you could simply do var whatever   new Array 5    this would give you  undefined  undefined  undefined  undefined  undefined   and then if you wanted it to be filled with empty strings  you could do whatever fill       which would give you   quot  quot    quot  quot    quot  quot    quot  quot    quot  quot    And if you want to do it in one line  var whatever   Array 5  fill

User · Answer

var arr   new Array 5   console log arr length     5

User · Answer

If you want to create anonymous array with some values so you can use this syntax   x000D   x000D  var arr   new Array 50  fill   map  d i   gt   i  console log arr  x000D   x000D   x000D

[javascript] javascript create empty array of a given size

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