Javascript array with for loop, returns only last element

Question

I have a for loop, that adds data into an array. but when I console.log the array, it is full of the last item of the for

Answer 1

Define material in the for block. As Objects are passed by reference same object is updated and pushed to the array.

for (var i = 0; i < ln; i++) {
    var material = {
        Product : {
            Name : materialsData[i].Product.Name,
            Id : materialsData[i].Product.Id,
        },
        StartingDate : materialsData[i].StartingDate.replace("T00:00:00", "").split('-').reverse().join('-'),
        Device : materialsData[i].Device
    };
    materials.push(material);
}

Additionally, You can use Array.map()

var materials = materialsData.map(function(m){
    return {
        Product : {
            Name : m.Product.Name,
            Id : m.Product.Id,
        },
        StartingDate : m.StartingDate.replace("T00:00:00", "").split('-').reverse().join('-'),
        Device : m.Device
    };
})