Array to multiple object in underscore

Question

I have an array that looks like this:

[{
    LocalBond:"0",
    LocalCash:"2.42",
    LocalEquity:"0",
    ForeignEquity: "4",
    ...
}]

What I want it look like:

[{
    Source: "LocalBond",
    Value: "0"
},
    Source: "LocalCash",
    Value: "2.42"
},
    Source: "LocalEquity",
    Value: "0"
},
{...}
]

I want to turn a single object into many objects. I also need the exclude the 'ForeignEquity' result.

I tried using _.map, and returning the fields I want, but I am struggling a bit. Am I on the right track? When I pass more than one parameter into my function, I don't get the desired result.

really the init array have a one object, or more objects?

allel
– allel

2016-12-29 08:05:00 +00:00
Commented Dec 29, 2016 at 8:05 — allel
– allel, Commented Dec 29, 2016 at 8:05

allel · Accepted Answer · 2016-12-29 08:29:10Z

1

The most simple code is pure javascript:

Using for..in access to the property of the object, and inside of the for loop build the array.

http://www.w3schools.com/jsref/jsref_forin.asp

Example:

https://jsfiddle.net/jewrsL8a/5/

var collection = [{
    LocalBond:"0",
    LocalCash:"2.42",
    LocalEquity:"0",
    ForeignEquity: "4"
}];

var result = [];

for (var property in collection[0]) {
    if(property!=='ForeignEquity'){
      result.push({'Source': property, 'Value': collection[0][property]});
    }
}

console.log(result);

edited Dec 29, 2016 at 8:29

answered Dec 29, 2016 at 8:12

allel

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5 Comments

Skotnik Over a year ago

'Value' in this case should be collection[0][property]

huan feng Over a year ago

let is not supportted well in some browsers

manneJan89 Over a year ago

Thanks, the only problem is that I do not really want to do an IF Statement excluding 20 odd values. Same goes for including. Trying to figure a way around. The IF statement is last resort.

manneJan89 Over a year ago

Thanks @allel for your answer. It gave me an idea. I did eventually end up using underscore. For the part about excluding values, I used underscores .contains filter and pushed the remaining values to an array. Worked perfectly!

Gruff Bunny Over a year ago

@jae.phoenix you could also use underscore's pick or omit to select the keys you want

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