Flatten javascript array with Multi-dimensional data

Question

How can one flatten this in javascript?

[
    [ task: 2 ],
    [ status: 'REFUND' ],
    [],
    [ amount: 872.2 ] 
]

To something like:

[task: 2, status: 'REFUND', amount: 872.2]

Tried several options including Array.prototype.reduce() but did not work for me.

No tomdemuyt. I get above from an array.push(), like this: var a = []; var b = []; var c = []; a[task] = 2; b[status] = 'REFUND'; c.push(a) c.push(b) For some reason I cannot put them in one variable. They come from different functions. — Cheruiyot Felix
– Cheruiyot Felix, Commented Jan 21, 2014 at 15:33

RyanS · Accepted Answer · 2014-01-21 15:17:09Z

1

You can use join()

A good starting point:

array[0] = array[0].join(", ");

answered Jan 21, 2014 at 15:17

RyanS

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Comments

Ali · Accepted Answer · 2014-01-22 20:45:38Z

1

you can use underscore.js

var u = require('underscore');
u.reduce(a, function(memo, item) { 
    var o = {}; 
    u.each(memo, function(v, k) { 
        o[k] = v; 
    }); 
    u.each(item, function(v, k) { 
        o[k] = v; 
    }); 
    return o;
});

Input:

[
    { task: 2 },
    { status: 'REFUND' },
    {},
    { amount: 872.2 }
]

Output:

{ 
   task: 2,
   status: 'REFUND',
   amount: 872.2 
}

edited Jan 22, 2014 at 20:45

answered Jan 22, 2014 at 20:09

Ali

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2 Comments

Dexygen Over a year ago

Doesn't underscore have a flatten method?

Ali Over a year ago

Underscore does have a flatten method. But you cannot use it in this case. It would have worked if it was an array of an array. But since its an array of an object _.flatten would return the input itself.

roland · Accepted Answer · 2014-01-22 20:37:03Z

0

Your syntax is invalid; there is no : allowed outside of an object literal.

var arr = [
  [{task: 2}],[{status: 'REFUND'}],[],[{amount: 872.2}]
];

To flatten your array, use the versatile reduce:

var result = arr.reduce(function(a,b) {
  return a.concat(b)
}); //result.length === 3

Your result contains 3 elements as [] is filter out

reduce is part of ECMAScript 5th edition. Ensure your browser supports it.

edited Jan 22, 2014 at 20:37

answered Jan 22, 2014 at 20:31

roland

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Comments

RIYAJ KHAN · Accepted Answer · 2015-07-08 05:40:01Z

0

Please check this one.

var a = [], b = [],c = [],d=[]; 
 a['task'] = 2;
 b['status'] = 'REFUND';
 d['amount']= 872.2

 c.push(a); 
 c.push(b);
 c.push(d) 
 var arr = [];
console.log(c)

for(var key in c){
    //console.log(Object.keys(c[key]),c[key][Object.keys(c[key])]);
     arr[Object.keys(c[key])]=c[key][Object.keys(c[key])];
   }

 console.log(arr)  // please see the console.

Here is the plunker

answered Jul 8, 2015 at 5:40

RIYAJ KHAN

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