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Reputation: 79

How to sum the values in for loop

element.all(by.tagName('strong')).count().then(function (number) {
    for (let i = 2; i < number; i=i+3) {
        element.all(by.tagName('strong')).get(i).getText().then(function (text2) {
                var text3 = text2.split(" ");
               var price = text3[1];
                console.log(price);
        });

    }

});

Output: 65000 50000 100000 85000

Here i wanted to get the sum of all the values. Can anyone please help me in getting the sum of all the values.

Upvotes: 1

Views: 1623

Answers (2)

Nurdaulet Bolatov
Nurdaulet Bolatov

Reputation: 71

You can try something like this using .reduce

let sum = element.all(by.tagName('strong')).reduce(function(acc, elem) {
  return elem.getText().then(function(text) {
    var text3 = text2.split(" ");
    var price = text3[1];
    return acc + price;
  });
}, 0);

UPD:

.reduce callback also accepts index if you want to skip particular elements.

let sum = element.all(by.tagName('strong')).reduce(function(acc, elem, index) {
  if ((index - 2) % 3 == 0) {
    return acc + 0;
  }
  return elem.getText().then(function(text) {
    var text3 = text2.split(" ");
    var price = text3[1];
    return acc + price;
  });
}, 0);

Upvotes: 1

Andy Ray
Andy Ray

Reputation: 32076

You need to keep track of a total variable, that you add to for each element's text you want to compare.

You need to convert the text of the element into a number. parseFloat() is one way to do that.

When working with async code (Promises, .then(), etc), you can only use values by chaining another .then() to the promise chain, to make sure the value is available. If you try to log total outside of a .then(), that console.log will execute long before your text totalling code runs.

Summing up, here's an example, that also removes the need for an extra element grab, since it looks like you can use .getText() on a collection:

let total = 0;
element.all(by.tagName('strong')).getText().then(function(strongTags) {
  for (let i = 2; i < strongTags.length; i = i + 3) {
    total += parseFloat(strongTags[i].split(' ')[1]);
  }
  return total;
}).then(function(total) => {
  console.log('The total is', total);
});

Upvotes: 3

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