Insert values in specific position of array javascript

Question

First I am creating an array with an specific size.

$("#bntSize").one('click', function(e){
          var memoria = $("#memoria").val();
          console.log(memoria)

          html = "";

          for(var i = 0; i < memoria ; i++){
               html += "<div class='square' name='mem"+i+"' data-id='"+i+"' data-pos='"+i+"' >"+i+"</div>";
               arrayMemoria.push('');
          }
          console.log(arrayMemoria)
          $("#contenedor").html(html);

        });

If memoria is equal to 7 I am getting this:

["", "", "", "", "", "", ""]

Now I am giving some values to the array:

var nada = 0;

function firstFit(){

          var cantidad = $("#ffinput").val();
          var value = $("#ffinput2").val();
          /*console.log(cantidad)*/

         if(nada == 0){
            for (nada ; nada < cantidad ; nada++) {
                arrayMemoria.splice(nada , 1 , value);
                nada = nada;
            }
         }
         else{

            for (nada; nada < arrayMemoria.length ; nada++) {
                arrayMemoria.splice(nada , 1 , value);
                nada = nada;
            }
         }

Here cantidad: how many spaces I am suppose to use in array & value: just a value.

So if I put => cantidad = 3 and value = A

["A", "A", "A", "", "", "", ""]

Then if I want to put => cantidad = 2 and value = B

["A", "A", "A", "B", "B", "B", "B"]

But I am trying to get this:

["A", "A", "A", "B", "B", "", ""]

and if I put => cantidad = 1 and value = C

["A", "A", "A", "B", "B", "C", ""]

And my second problem

If I do remove the values equals to A and I am inserting => cantidad = 2 AND VALUE = D I am suppose to get this:

["D", "D", "", "B", "B", "C", ""]

How to count the available space in my array? cause if I want to insert

cantidad = 1 and value = E , I need to get the first available space

["D", "D", "E", "B", "B", "C", ""]

If someone can help me please!!

Monasha · Accepted Answer · 2016-11-07 08:37:44Z

You can try the following code

	var arr = ["", "", "", "", "", "", ""];
    arr = insertValue(3, "A", arr);
    console.log(arr);
    arr = insertValue(2, "B", arr);
    console.log(arr);
    arr = insertValue(1, "C", arr);
    console.log(arr)
    arr = removeValue("A", arr);
    console.log(arr)
    arr = insertValue(2, "D", arr);
    console.log(arr)
    
    
	function insertValue(cantidad, value, arr){
		var arrLength = arr.length;
		var count = 0;
		for (var i = 0; i < arrLength; i++) {
			if(arr[i] == "" && count < cantidad){
				arr[i] = value;
				count ++;
			}
		};
      return arr;
	}

	function removeValue(value, arr){
		var arrLength = arr.length;
		for (var i = 0; i < arrLength; i++) {
			if(arr[i] == value){
				arr[i] = "";
			}
		};
      return arr;
	}

EDIT: To get the number of spaces in the array

var arr = ["A", "A", " " , " ", " " , "B" ,"C " , " "];
var  spaceCount = 0; 

arr.forEach(function(i) { if(i == " ") spaceCount++;  });
console.log(spaceCount)

EDIT 2: To count consecutive spaces in an array

var arr = ["A", "A", " " , " ", " " , "B"," ", " " ,"C " , " "];
var count = 1;
var countArr = [];

for (var i = 0; i < arr.length; i++) {
	if(arr[i] == " "){
		if(arr[i+1] == arr[i]){
			count ++;
		}else {
			countArr.push(count);
			count = 1;
		}
	}
};

console.log(countArr)

EDIT 3: To get consecutive space count + starting position

var arr = [" ", "A", "A", " " , " ", " " , "B"," ", " " ,"C " , " "];
var count = 1;
var countArr = [];

var pos = 0;

for (var i = 0; i < arr.length; i++) {
	if(arr[i] == " "){
		if(arr[i] === arr[i+1]){
			count ++;
		}else {
			countArr.push({'pos': pos, 'count': count});
			count = 1;
		}
	}else{
		pos = i+1;
	}
};

console.log(countArr)

can you help me with one more problem? what happen if i have this array ["A", "A", " " , " ", "B", " " , " " , " "] and i want to insert cantidad = 1 , and the expected result will be ["A", "A", " " , " ", " " , "B" ,"C " , " "] and if i want to insert cantidad = 3 ["A", "A", "D" , "D ", "D", "B", " C", " "] , how i can count exactly how many blank space are in the array and put the value in the best position to save space for a bigger cantidad
Any way to count consecutive spaces? i mean : count the first 3 spaces: count = 3 and then count = 1 for the last space, so in that way i will know that i have to insert the value in the last space.
@Eliott I have added the code for consecutive spaces in an array

almost a beginner · Accepted Answer · 2016-11-07 05:26:59Z

  var array = ["A", "", "", "", "B", "B", "B"];

  var cantidad = 2;
  for (var x = 0; x < array.length; x++) {
    if (array[x] === "") {
      if (cantidad >0){
        array.splice(x, 1, "C");
        cantidad--;
      }
    }
  }

  function codeAddress() {
    alert(array);
  }

  window.onload = codeAddress;

Here's a solution, I realized you can solve this problem in a lot of different ways, mine is not necessarily the best approach.

Good luck.

ppovoski · Accepted Answer · 2016-11-07 05:13:27Z

EDIT: This is a working solution for both questions.

var array = ["","","","","","",""];

function addValues(num, value) {
    for(var i=0; i<num; i++) {
        for(var j=0; j<array.length; j++){
            if(array[j] ==="") {
                array[j] = value;
                break;
            }
        }
    }
}

function removeValues(value) {
    for(var i=0; i<array.length; i++) {
        if(array.indexOf(value) !== -1) {
            array[i] = "";
        }
    }

}
addValues(3, 'A');
addValues(2, 'B');
addValues(1, 'C');

removeValues('A');

addValues(2, 'D');
addValues(2, 'E');

console.log(array);

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Insert values in specific position of array javascript

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