Below is a collection of objects:
var items = [
{"label" : "1", "value" : 12},
{"label" : "2", "value" : 15},
{"label" : "3", "value" : 20},
{"label" : "4", "value" : 25}
];
I am looking for a way to dynamically add values to this array. I attempted the code below without success:
var labels =["1","2","3", "4"];
var values = [42,55,51,22];
var newData = new Array();
for(var i=0; i<4; i++){
newData[i].label = labels[i];
newData[i].value = values[i];
}
If you want to use the object, you have to first instantiate it. A simple way to do this is shown below:
var languages =["JavaScript","Python","Java"];
var users = [100,200,150,300];
var info = [];
for(var i=0; i<4; i++) {
info.push({language: languages[i], userCount: users[i]});
}
Alternatively, you can achieve the same result, but in a less concise manner that resembles your original code:
for(var i=0; i<4; i++) {
info[i] = {}; // creates a new object
info[i].language = languages[i];
info[i].userCount = users[i];
}
array() will not create a new array (unless you defined that function). Use either Array(), new Array(), or simply [].
I suggest reading through the MDN JavaScript Guide for a deeper understanding.
During the year 2019, an efficient and concise method to achieve this task is by utilizing Javascript's ES6 Spread syntax.
data = [...data, {"label": 2, "value": 13}]
Illustrative Examples
var data = [
{"label" : "1", "value" : 12},
{"label" : "1", "value" : 12},
{"label" : "1", "value" : 12},
];
data = [...data, {"label" : "2", "value" : 14}]
console.log(data)In your specific scenario (even though it pertains to 2011), similar outcomes can be achieved using map() & forEach() as shown below
var lab = ["1","2","3","4"];
var val = [42,55,51,22];
//Using forEach()
var data = [];
val.forEach((v,i) =>
data= [...data, {"label": lab[i], "value":v}]
)
//Using map()
var dataMap = val.map((v,i) =>
({"label": lab[i], "value":v})
)
console.log('data: ', data);
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