Q21. How do you combine two or more arrays?
The concat() method is used to join two or more arrays by returning a new array containing all the elements. The syntax would be as below, ```javascript array1.concat(arr...
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Q22. What happens with negating an array?
Negating an array with `!` character will coerce the array into a boolean. Since Arrays are considered to be truthy So negating it will return `false`. ```javascript cons...
Q23. What happens if we add two arrays?
If you add two arrays together, it will convert them both to strings and concatenate them. For example, the result of adding arrays would be as below, ```javascript conso...
Q24. How do you create self string using special characters?
The self string can be formed with the combination of `[]()!+` characters. You need to remember the below conventions to achieve this pattern. 1. Since Arrays are truthfu...
Q25. How do you display data in a tabular format using console object?
The `console.table()` is used to display data in the console in a tabular format to visualize complex arrays or objects. ```js const users = [ { name: "John", id: 1, city...
Q26. How do you flattening multi dimensional arrays?
Flattening bi-dimensional arrays is trivial with Spread operator. ```javascript const biDimensionalArr = [11, [22, 33], [44, 55], [66, 77], 88, 99]; const flattenArr = []...
Q27. What are the differences between spread operator and rest parameter?
Rest parameter collects all remaining elements into an array. Whereas Spread operator allows iterables( arrays / objects / strings ) to be expanded into single arguments/...
Q28. What are the built-in iterables?
Below are the list of built-in iterables in javascript, 1. Arrays and TypedArrays 2. Strings: Iterate over each character or Unicode code-points 3. Maps: iterate over its...
Q29. What is the difference between dense and sparse arrays?
An array contains items at each index starting from first(0) to last(array.length - 1) is called as Dense array. Whereas if at least one item is missing at any index, the...
Q30. What are the different ways to create sparse arrays?
There are 4 different ways to create sparse arrays in JavaScript 1. **Array literal:** Omit a value when using the array literal ```js const justiceLeague = ["Superman", ...