How to separate arrays in js

Question

I have a data of 82 items and i want to write 10 each in a file.How can i separate the array such that i get 10 each and 2 in another file.

MY code,

 var data  = [];
 data.forEach(function(i,v) {
   if((v != 0) && (v%10 === 0)) {
      var appendData = blogList.splice(0,10);
      fs.writeFile(appendData){

      }
   }

I have a data of 82 items and i want to write 10 each in a file.How can i separate the array such that i get 10 each and 2 in another file.

But I am getting the first 10 items in files.Can anyone help me.Thanks.

where do blogList intervene in your program. You are using splice on it and we have no idea what actually it is. — franckstifler, Jun 20 '17 at 06:45
can you try this https://stackoverflow.com/questions/8495687/split-array-into-chunks — Prasad Gayan, Jun 20 '17 at 06:48
This solved my problem....https://stackoverflow.com/questions/11318680/split-array-into-chunks-of-n-length — K L P, Jun 20 '17 at 06:55

Vivek Doshi · Answer 1 · 2017-06-20T06:47:12.620

1

Simple solution to this is :

let chunk = 10;
for (let i=0,j=blogList.length ; i<j ; i+=chunk) {
    let  appendData = blogList.slice(i,i+chunk);
    fs.writeFile(appendData){
        .....
    }
}

only the first 10 into the file

let  appendData = blogList.slice(0,10);
fs.writeFile(appendData){
    .....
}

edited Jun 20 '17 at 06:47

answered Jun 20 '17 at 06:39

Vivek Doshi

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score 0 · Answer 2 · answered Jun 20 '17 at 06:43

You have to get the new file each time you reach 10 elements. If the current index is not a multiple of 10 then you should simply add the value to the current file

var data = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K"];
var myFile = "";//Get new file
data.foreach((x, i){
  if(i%10===0){
    myFile = ...//Get new file
  }
  myFile.writeFile(x){...}//Add the data to the file
});

Maher · Answer 3 · 2017-06-20T06:51:59.907

With this code you will have a array with objects as {group: n, data:[]}, which you can use ng-repeat on the data

var app = angular.module("app", []);

app.controller("ctrl", ["$scope", function($scope) {

  var data = ["a", "b", "c", "d", "e", "f", "g", "h", "k", "l", "m", "n", "o", "r", "i", "q", "s", "t", "x", "z", "u", "hh"];

  $scope.array = [];
  var index = 1;
  while (data.length) {
    var object = {
      group: index++,
      data: []
    };
    object.data = data.splice(0, 10);
    $scope.array.push(object);
  }

}]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<div class="container" ng-app="app" ng-controller="ctrl">
  <ul class="list-group" ng-repeat="object in array">
    <li class="list-group-item active">group {{object.group}}</li>
    <li class="list-group-item" ng-repeat="item in object.data">{{item}}</li>
  </ul>
</div>

score 0 · Answer 4 · answered Jun 20 '17 at 06:52

Try this

var data = [];
for(var i=0;i<82;i++){
    data.push(i);
}
var chunkSize = 10;

var arr = data.reduce((acc, item, idx) => {
  let group = acc.pop();
  if (group.length == chunkSize) {
    acc.push(group);
    group = [];
  }
  group.push(item);
  acc.push(group);
  return acc;
}, [[]]);

console.log(arr);

How to separate arrays in js

4 Answers4