CODEWITHSUNDEEP
javascript
Pravin
Pravin

Reputation: 1701

How to typecast in javascript?

I am trying to add total of my data:

[{"sector": "Basic drinking water supply and basic sanitation", "budget": 558733.7, "no": 8},
{"sector": "Culture and recreation", "budget": 1550000.0, "no": 2},
{"sector": "Roads", "budget": 1221142.04, "no": 4},
{"sector": "Agriculture", "budget": "", "no": 1},
{"sector": "Health", "budget": "", "no": 4},
{"sector": "Education", "budget": 473379.58, "no": 6},
{"sector": "Energy generation & supply", "budget": 584624.55, "no": 1},
{"sector": "Agricultural water resources", "budget": 40000.0, "no": 1}]

so my code goes like this:

for(i=0;i<data.length;i++){
data[i]["budget"]= +data[i]["budget"];
console.log(+data[i]["budget"]);
end_val+= data[i]["budget"];
console.log(end_val);
}

but the output is concatenation of string. Why does javascript not typecast my values to integer? i tried parseInt() too.

Upvotes: 0

Views: 330

Answers (5)

sandeep
sandeep

Reputation: 11

It would be much better if you use :---> Typecast.js

var sum = 0;
for (i=0 ; i<data.length ; i++){
    var val = type.num.to(data[i]["budget"]);
    sum += type.nan(val) ? 0 : val;//---->HERE You dont even need to do this validation 
}
console.log(sum);

Typecast.js--->LINK:

Typecast is distributed under the MIT licence

Upvotes: 1

Gilsha
Gilsha

Reputation: 14591

Initialize end_val variable to 0. Check whether both the operands are of type Number when you use increment operator for number addition.

var end_val = 0;
for(i=0;i<data.length;i++){        
     end_val+= parseFloat(data[i]["budget"]);
     console.log(end_val);
}

Upvotes: 1

Yuliam Chandra
Yuliam Chandra

Reputation: 14640

You want to sum all the budget right?

You need to cast using parseFloat and check whether the parsed value is a number or not using isNaN.

var data = [
    {"sector": "Basic drinking water supply and basic sanitation", "budget": 558733.7, "no": 8},
    {"sector": "Culture and recreation", "budget": 1550000.0, "no": 2},
    {"sector": "Roads", "budget": 1221142.04, "no": 4},
    {"sector": "Agriculture", "budget": "", "no": 1},
    {"sector": "Health", "budget": "", "no": 4},
    {"sector": "Education", "budget": 473379.58, "no": 6},
    {"sector": "Energy generation &amp; supply", "budget": 584624.55, "no": 1},
    {"sector": "Agricultural water resources", "budget": 40000.0, "no": 1}
];

var sum = 0;
for (i=0 ; i<data.length ; i++){
    var val = parseFloat(data[i]["budget"]);
    sum += isNaN(val) ? 0 : val;
}
console.log(sum);

DEMO

Upvotes: 1

maček
maček

Reputation: 77778

Array.prototype.reduce should sum everything up easily

var sum = data.reduce(function(sum, row) {
  return sum += Number(row.budget);
}, 0);

As for the string issue, that's happing because some rows have {budget: ""}. When a string is added to a float in JavaScript, it becomes a string. Additional "additions" will be string concatenations.

Note: this requires ECMAScript >= 5

Upvotes: 1

link
link

Reputation: 2510

The problem is that some of your values are not integers.

Try using parseFloat()

Hope this helps.

Upvotes: 0

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