create an array of keys js code example

Example 1: javascript create array of object keys

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var apple = {
  'color': 'red',
  'editable': true,
  'weight': '100 grams',
};

var appleKeys = Object.keys(apple);
console.log(appleKeys);
// returns an array ['color', 'editable', 'weight']

Example 2: array of array key value javascript

var categories = [
    {"1":"Category 1"},
    {"2":"Category 2"},
    {"3":"Category 3"},
    {"4":"Category 4"}
];