CODEWITHSUNDEEP
javascriptopenwhisk
zak
zak

Reputation: 95

Openwhisk and javascript issue

I want to do something really simple. I want to find the total sum of all the elements of a JSON object via openwhisk and javascript. However, the following code gives 0 as a result.

function sum(params){
        var s=0;
        for(var i=0; i<params.length; i++) s+=params[i];
        return s;
}

function main(params){
        return {payload : sum(params)};
}

As an input I have for instance this {0: 2, 1: 56, 2: 99, 3:12} Any suggestions?

Upvotes: 1

Views: 67

Answers (2)

Sajib Khan
Sajib Khan

Reputation: 24174

{0: 2, 1: 56, 2: 99, 3:12} this is object so, params.length is not valid.

Try the array input:

[2, 56, 99, 12]

Otherwise, loop through the object:

function sum(params){
    var s=0;
    for(var key in params) {
      if (params.hasOwnProperty(key)) {
        s += parseInt(params[key]);
      }
    }
    return s;
}

function main(params){
    return {payload : sum(params)};
    // params = {0: 2, 1: 56, 2: 99, 3:12}
}

Upvotes: 2

markusthoemmes
markusthoemmes

Reputation: 3120

More of a JavaScript than an OpenWhisk question, but here you go:

function sum(params) {
    return Object.values(params).reduce((acc, cur) => acc + cur);
}

function main(params) {
    return {payload: sum(params)};
}

Object.values(obj) returns an array of all values in the object. reduce aggregates all values of an array into a single value using the aggregation function (acc + cur in this case)

Upvotes: 3

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