How to create an array of object literals in a loop?

How to create an array of object literals in a loop?

I need to create an array of object literals like this:
var myColumnDefs = [
{key:”label”, sortable:true, resizeable:true},
{key:”notes”, sortable:true,resizeable:true},……

In a loop like this:
for (var i = 0; i < oFullResponse.results.length; i++) { console.log(oFullResponse.results[i].label); } The value of key should be results[i].label in each element of the array.

Solutions/Answers:

Solution 1:

var arr = [];
var len = oFullResponse.results.length;
for (var i = 0; i < len; i++) {
    arr.push({
        key: oFullResponse.results[i].label,
        sortable: true,
        resizeable: true
    });
}

Solution 2:

RaYell’s answer is good – it answers your question.

It seems to me though that you should really be creating an object keyed by labels with sub-objects as values:

var columns = {};
for (var i = 0; i < oFullResponse.results.length; i++) {
    var key = oFullResponse.results[i].label;
    columns[key] = {
        sortable: true,
        resizeable: true
    };
}

// Now you can access column info like this. 
columns['notes'].resizeable;

The above approach should be much faster and idiomatic than searching the entire object array for a key for each access.

Solution 3:

This is what Array#map are good at

var arr = oFullResponse.results.map(obj => ({
    key: obj.label,
    sortable: true,
    resizeable: true
}))

Solution 4:

In the same idea of Nick Riggs but I create a constructor, and a push a new object in the array by using it. It avoid the repetition of the keys of the class:

var arr = [];
var columnDefs = function(key, sortable, resizeable){
    this.key = key; 
    this.sortable = sortable; 
    this.resizeable = resizeable;
    };

for (var i = 0; i < len; i++) {
    arr.push((new columnDefs(oFullResponse.results[i].label,true,true)));
}

Solution 5:

This will work:

 var myColumnDefs = new Object();
 for (var i = 0; i < oFullResponse.results.length; i++) {
     myColumnDefs[i] = ({key:oFullResponse.results[i].label, sortable:true, resizeable:true});
  }

Solution 6:

I’d create the array and then append the object literals to it.

var myColumnDefs = [];

for ( var i=0 ; i < oFullResponse.results.length; i++) {

    console.log(oFullResponse.results[i].label);
    myColumnDefs[myColumnDefs.length] = {key:oFullResponse.results[i].label, sortable:true, resizeable:true};
}

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