for(var i = 0; i < fruits.length; i++) {
var obj = {}; // <---- Move declaration inside loop
obj['data'] = fruits[i];
obj['label'] = label;
arr.push(obj);
}
var arr = fruits.map(fruit => ({
data: fruit,
label: label
}));
var arr = [];
var fruits = ['banana', 'apple', 'mango'];
var label = 'Fruits';
for (var i = 0; i < fruits.length; i++) {
var obj = {};
obj['data'] = fruits[i];
obj['label'] = label;
arr.push(obj);
}