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How to populate all the array values to a single index in javascript


How to populate all the array values to a single index in javascript

By : sai
Date : November 22 2020, 04:01 AM
it fixes the issue If you have an unknown number if arrays, you can use reduce with concat:
code :
let data = [
[{sets: Array(1), size: 12},{sets: Array(1), size: 12},{sets: Array(1), size: 12},{sets: Array(2), size: 2},{sets: Array(2), size: 2},{sets: Array(2), size: 2}],
[{sets: Array(1), size: 12},{sets: Array(1), size: 12},{sets: Array(1),size: 12},{sets: Array(2), size: 2},{sets: Array(2), size: 2},{sets: Array(2), size: 2}]];

var merged = data.reduce((acc, arr) => acc.concat(arr), []);
console.log(merged);


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Populate php array from mysql with different values for the same array index

Populate php array from mysql with different values for the same array index


By : user3785827
Date : March 29 2020, 07:55 AM
Any of those help I have a mysql DB with those column id , idUser , idCompany , idProfession for users table. , Does this do what you want?
code :
$users=array();
$sql_result="SELECT * FROM users";

while($row = mysql_fetch_array($sql_result,MYSQL_BOTH)){
    $users[ $row['idUser'] ][] = array('idCompany' => $row['idCompany'], 'profession' => $row['idProfession'] ); 
}
array(
  idUser => array(
      array('idCompany', 'profession'),
      array('idCompany', 'profession'),
      etc..
     )
)
JS merge 2 arrays and their individual values from a single index into a single index in 1 array

JS merge 2 arrays and their individual values from a single index into a single index in 1 array


By : Marco da Silva
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You can move that lastSeenAt's init out of the function. And assign new value at the end of the function.
To get combinedresults, use the shorter of mouseDistance and timers, and push the data into combinedresults should work.
code :
var mouseDistance = new Array();
var timers = new Array();
var combinedresults = new Array();
// Init with both is null.
var lastSeenAt = {
  x: null,
  y: null
};

//THIS FUNCTION CALCULATES THE DISTANCE MOVED
function printMousePos(e) {
  var cursorX = e.clientX;
  var cursorY = e.clientY;

  // Don't calculate when x, y is null, which is the first time.
  // Or you can give lastSeen some other initValue rather than (null, null).
  if (lastSeenAt.x !== null) {
    var math = Math.round(Math.sqrt(Math.pow(lastSeenAt.y - cursorY, 2) +
        Math.pow(lastSeenAt.x - cursorX, 2)));
    mouseDistance.push(math);      
  }

  // Keep the x,y value.
  lastSeenAt.x = cursorX;
  lastSeenAt.y = cursorY;
}

function stopCount() {
    clearTimeout(t);
    timer_is_on = 0;
    timers.push(t);
}

// get combinedresults 
function getCombinedResult() {
  // Get the shorter length.
  var length = Math.min(mouseDistance.length, timers.length);
  var i;

  // 
  for (i = 0; i < length; ++i) {
    combinedresults[i] = [timers[i], mouseDistance[i]];
  }
}
Attempting to set single value at Javascript array index. It is mass-assigning values instead

Attempting to set single value at Javascript array index. It is mass-assigning values instead


By : Harshvardhan.W
Date : March 29 2020, 07:55 AM
around this issue You need to push independent arrays to the outer array. Javascript uses an object reference and you push the same reference to the outer array.
code :
function initArrays(n) {
  const array = []
  const subArray = []
  for (let i = 0; i < n; i++) {
    subArray.push(0)
  }
  for (let i = 0; i < n; i++) {
    array.push(subArray.slice());  // get copy of primitive values
  }
  return array
}


var array = initArrays(3);

array[1][1]= 9;

console.log(array);
How to populate an array in javascript if I want to have multiple elements for a single index of an array

How to populate an array in javascript if I want to have multiple elements for a single index of an array


By : user3325149
Date : March 29 2020, 07:55 AM
To fix the issue you can do You would have to have an object assigned to each index of the array, and each of those objects would have the firstName and lastName properties.
Ex:
code :
let person = [];
person[0] = {firstName: 'Dilshadur', lastName: 'Rahman'};
person[1] = {firstName: 'Tabassum Monia', lastName: 'Disha'};
class Person {
    constructor(first, last) {
        this.firstName = first;
        this.lastName = last;
    }
}

let person = [];
person[0] = new Person('Dilshadur', 'Rahman');
person[1] = new Person('Tabassum Monia', 'Disha');
How can i populate 3 columns with a single array of strings (Javascript, HTML)

How can i populate 3 columns with a single array of strings (Javascript, HTML)


By : aquariuskon
Date : March 29 2020, 07:55 AM
Hope that helps You can use splice to extract the first 5 elements from your array into a new array, then use join() to join the elements. Based on your description this code should work:
Updated
code :
let arr = [0 ,1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14];
let columns = [".col1", ".col2", ".col3"]
for(let i = 0; i<3; i++)
  document.querySelector(columns[i]).innerHTML = `<li>${arr.splice(0, 5).join("</li><li>")}</li>`;
body{
display: grid;
grid-template-columns: 1fr 1fr 1fr;
}
<ul class="col1"></ul>
<ul class="col2"></ul>
<ul class="col3"></ul>
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