Is there an arraylist in Javascript

Question

I have a bunch of things I want to add into an array  and I don t know what the size of the array will be beforehand  Can I do something similar to the c  arraylist in javascript  and do myArray Add object   repeatedly on it

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With javascript all arrays are flexible   You can simply do something like the following   var myArray        myArray push object   myArray push anotherObject

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You don t even need push  you can do something like this -  var A  10 20 30 40    A A length  50

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Arrays are pretty flexible in JS  you can do   var myArray   new Array    myArray push  string 1    myArray push  string 2

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javascript uses dynamic arrays  no need to declare the size beforehand  you can push and shift to arrays as many times as you want  javascript will handle allocation and stuff for you

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just use array push     var array         array push value     This will add another item to it   To take one off  use array pop     Link to JavaScript arrays  https   developer mozilla org en-US docs Web JavaScript Reference Global Objects Array

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Try this  maybe can help  it do what you want   ListArray   x000D   x000D  var listArray   new ListArray    x000D  let element    name   Edy   age  27  country   Brazil    x000D  let element2    name   Marcus   age  27  country   Brazil    x000D  listArray push element   x000D  listArray push element2   x000D   x000D  console log listArray array  x000D   lt script src  https   marcusvi200 github io list-array script ListArray js  gt  lt  script gt  x000D   x000D   x000D

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There is no ArrayList in javascript   There is however ArrayECMA 5 1 which has similar functionality to an  ArrayList   The majority of this answer is taken verbatim from the HTML rendering of Ecma-262 Edition 5 1  The ECMAScript Language Specification   Defined arrays have the following methods available     toString      toLocaleString      concat     item1     item2                 When the concat method is called with zero or more arguments item1  item2  etc   it returns an array containing the array elements of the object followed by the array elements of each argument in order   join  separator  The elements of the array are converted to Strings  and these Strings are then concatenated  separated by occurrences of the separator  If no separator is provided  a single comma is used as the separator   pop     The last element of the array is removed from the array and returned   push     item1     item2                 The arguments are appended to the end of the array  in the order in which they appear  The new length of the array is returned as the result of the call    reverse     The elements of the array are rearranged so as to reverse their order  The object is returned as the result of the call   shift     The first element of the array is removed from the array and returned    slice  start  end  The slice method takes two arguments  start and end  and returns an array containing the elements of the array from element start up to  but not including  element end  or through the end of the array if end is undefined    sort  comparefn  The elements of this array are sorted  The sort is not necessarily stable  that is  elements that compare equal do not necessarily remain in their original order   If comparefn is not undefined  it should be a function that accepts two arguments x and y and returns a negative value if x  lt  y  zero if x   y  or a positive value if x   y   splice  start  deleteCount     item1     item2                 When the splice method is called with two or more arguments start  deleteCount and  optionally  item1  item2  etc   the deleteCount elements of the array starting at array index start are replaced by the arguments item1  item2  etc  An Array object containing the deleted elements  if any  is returned   unshift     item1     item2                 The arguments are prepended to the start of the array  such that their order within the array is the same as the order in which they appear in the argument list   indexOf   searchElement     fromIndex     indexOf compares searchElement to the elements of the array  in ascending order  using the internal Strict Equality Comparison Algorithm  11 9 6   and if found at one or more positions  returns the index of the first such position  otherwise  -1 is returned   lastIndexOf   searchElement     fromIndex     lastIndexOf compares searchElement to the elements of the array in descending order using the internal Strict Equality Comparison Algorithm  11 9 6   and if found at one or more positions  returns the index of the last such position  otherwise  -1 is returned   every   callbackfn     thisArg     callbackfn should be a function that accepts three arguments and returns a value that is coercible to the Boolean value true or false  every calls callbackfn once for each element present in the array  in ascending order  until it finds one where callbackfn returns false  If such an element is found  every immediately returns false  Otherwise  if callbackfn returned true for all elements  every will return true   some   callbackfn     thisArg     callbackfn should be a function that accepts three arguments and returns a value that is coercible to the Boolean value true or false  some calls callbackfn once for each element present in the array  in ascending order  until it finds one where callbackfn returns true  If such an element is found  some immediately returns true  Otherwise  some returns false   forEach   callbackfn     thisArg     callbackfn should be a function that accepts three arguments  forEach calls callbackfn once for each element present in the array  in ascending order   map   callbackfn     thisArg     callbackfn should be a function that accepts three arguments  map calls callbackfn once for each element in the array  in ascending order  and constructs a new Array from the results   filter   callbackfn     thisArg     callbackfn should be a function that accepts three arguments and returns a value that is coercible to the Boolean value true or false  filter calls callbackfn once for each element in the array  in ascending order  and constructs a new array of all the values for which callbackfn returns true   reduce   callbackfn     initialValue     callbackfn should be a function that takes four arguments  reduce calls the callback  as a function  once for each element present in the array  in ascending order   reduceRight   callbackfn     initialValue     callbackfn should be a function that takes four arguments  reduceRight calls the callback  as a function  once for each element present in the array  in descending order    and also the length property

User · Answer

In Java script you declare array as below   var array     array push      and for arraylist or object or array you have to use json  and Serialize it using json by using following code    var serializedMyObj   JSON stringify myObj

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Use javascript array push   method  it adds the given object in the end of the array  JS Arrays are pretty flexible you can push as many objects as you wish in an array without specifying its length beforehand  Also different types of objects can be pushed to the same Array

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Just use array push something    Javascript arrays are like ArrayLists in this respect - they can be treated like they have a flexible length  unlike java arrays

[javascript] Is there an arraylist in Javascript?

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