Javascript map function to create multiple objects

Question

I need some dummy data that I can use. I usually, manually create my data in a variable like...

const jsonData = [
  {
    name: 'random',
    age: '0',
  }
];

I'm trying to create a function that gives me back an array with a list of objects in (like the above) the amount of objects in the array is based on the value I give it.

I came to the conclusion using the map function would be best, like so:

const myMap = new Map();

myMap.forEach((q, n) => {

});

I'm still learning. Honestly now sure how I'd go about creating this.

A JavaScript object is not the same as JSON. There's no such thing as a "JSON Object" — Felix Kling
– Felix Kling, Commented Jun 14, 2017 at 13:35
Look for "dummy" APIs, that serve lists in JSON. For example, JSONPlaceholder. — glhrmv
– glhrmv, Commented Jun 14, 2017 at 13:37

Felix Kling · Accepted Answer · 2017-06-14 13:45:21Z

3

You can use a simple loop:

function genData(n) {
  var results = [];
  for (var i = 0; i < n; i++) {
    results.push({name: 'random', age: 0});
  }
  return results;
}

If you want to randomize the property values, look into Math.random.

Here is a simple example that picks a random value from provided lists:

function genData(n, values) {
  var results = [];
  for (var i = 0; i < n; i++) {
    var obj = {};
    for (var prop in values) {
      obj[prop] = values[prop][Math.floor(Math.random() * values[prop].length)];
      results.push(obj);
    }
  }
  return results;
}

console.log(genData(3, {name: ['foo', 'bar', 'baz'], age: [0, 10, 20, 30, 40]}));

edited Jun 14, 2017 at 13:45

answered Jun 14, 2017 at 13:39

Felix Kling

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