CODEWITHSUNDEEP
javascriptjqueryarrays
Ekky Cahya Dhitia
Ekky Cahya Dhitia

Reputation: 11

How to split and get selection data from an array

I have array like this in JavaScript

var a = [1,2,3,4,5,"4","12","2",6,7,"4",3,"2"];

My questions are

  1. How do I split the array to change, (comma) to ";"

  2. How do I return the number of strings in the array as well as return total value regardless of variable type.

  3. How do I return the average value (regardless of variable type again)

Upvotes: 0

Views: 201

Answers (5)

Nina Scholz
Nina Scholz

Reputation: 386746

All results in one loop.

0 ... n-4: Data
n-3: Count of all strings
n-2: Sum
n-1: Average

var data = [1, 2, 3, 4, 5, "4", "12", "2", 6, 7, "4", 3, "2"],
    result = data.concat(data.reduce(function (r, a, i) {
        typeof a === 'string' && r[0]++;
        r[1] += +a;
        r[2] = r[1] / i;
        return r;
    }, [0, 0, 0])).join(';');

document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');

Upvotes: 0

Matt Butler
Matt Butler

Reputation: 476

Change array separator:

a.join(';');

as referenced here

Number of strings in array:

var stringCount = 0;
for (var i = 0; i < a.length; i++){
  if (typeof a[i] === 'string'){
    stringCount++;
  }
}

alert("The number of strings is: " + stringCount);

Test it here: https://jsfiddle.net/6c42nugy/2/

Number of all elements in array:

var entireLength = a.length;

Percentage per type in comparison to whole

var stringPerc = (stringCount)/(stringCount + entireLength)

var otherPerc = (entireLength - stringCount)/(stringCount + entireLength)

Upvotes: 1

itachi
itachi

Reputation: 3597

Here is my version:

var a = [1,2,3,4,5,"4","12","2",6,7,"4",3,"2"], sum = 0, strings = 0;

var joined = a.join(';');
console.log("Joined: " + joined);

for (var i = 0; i < a.length; i++) {
    sum += parseInt(a[i]);

    if (typeof a[i] === "string") {
        strings++;
    }
}

var avg = sum / a.length;

console.log('Sum: ' + sum);
console.log('Average: ' + avg);
console.log('Strings: ' + strings);

And link to JSFiddle.

Upvotes: 0

michael
michael

Reputation: 758

Use a.join(';'); to convert the array into a string separated by semicolons.

To return the number of strings in the array, simply iterate through it and use toString.call() like this:

var total = 0;
for (var i = 0, n = a.length; i < n; i++) {
    if (toString.call(a[i]) === '[object String]') total++;
}

To simply return the total number of items, you can do a.length.

If you want the total value as in all the elements summed, you can do this:

var total = 0;
for (var i = 0, n = a.length; i < n; i++) {
    total += parseInt(a[i]);
}

If you want the average, just take the code above and do total / a.length;.

Upvotes: 0

Satej S
Satej S

Reputation: 2156

Answering Question 1

1.Convert it to a string

var x=a.toString();

2.Perform a global replace

var y= x.replace(/,/g,";");

3.This gives you "1;2;3;4;5;4;12;2;6;7;4;3;2"

For Question 2 Simply use the a.length method.This will give you the total number of elements.I'm not sure about the String elements part.

Upvotes: 1

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