javascript array keys code example
Example 1: js key value array
var myArray = {id1: 100, id2: 200, "tag with spaces": 300};
myArray.id3 = 400;
myArray["id4"] = 500;
for (var key in myArray) {
console.log("key " + key + " has value " + myArray[key]);
}
Example 2: .keys() array
var arr = ['a', , 'c'];
var sparseKeys = Object.keys(arr);
var denseKeys = [...arr.keys()];
console.log(sparseKeys);
console.log(denseKeys);
Example 3: array of array key value javascript
var categories = [
{"1":"Category 1"},
{"2":"Category 2"},
{"3":"Category 3"},
{"4":"Category 4"}
];