const printResult = (a, b) => {

    return a + b;

}

console.log(printResult(5, 8));

//Expected output: 13

concat(arr1,[...]) // Joins two or more arrays, and returns a copy of the joined arrays

copyWithin(target,[start],[end]) // Copies array elements within the array, to and from specified positions

entries() // Returns a key/value pair Array Iteration Object

every(function(currentval,[index],[arr]),[thisVal]) // Checks if every element in an array pass a test

fill(val,[start],[end]) // Fill the elements in an array with a static value

filter(function(currentval,[index],[arr]),[thisVal]) // Creates a new array with every element in an array that pass a test

find(function(currentval,[index],[arr]),[thisVal]) // Returns the value of the first element in an array that pass a test

findIndex(function(currentval,[index],[arr]),[thisVal]) // Returns the index of the first element in an array that pass a test

forEach(function(currentval,[index],[arr]),[thisVal]) // Calls a function for each array element

from(obj,[mapFunc],[thisVal]) // Creates an array from an object

includes(element,[start]) // Check if an array contains the specified element

indexOf(element,[start]) // Search the array for an element and returns its position

isArray(obj) // Checks whether an object is an array

join([seperator]) // Joins all elements of an array into a string

keys() // Returns a Array Iteration Object, containing the keys of the original array

lastIndexOf(element,[start]) // Search the array for an element, starting at the end, and returns its position

map(function(currentval,[index],[arr]),[thisVal]) // Creates a new array with the result of calling a function for each array element

pop() // Removes the last element of an array, and returns that element

push(item1,[...]) // Adds new elements to the end of an array, and returns the new length

reduce(function(total,currentval,[index],[arr]),[initVal]) // Reduce the values of an array to a single value (going left-to-right)

reduceRight(function(total,currentval,[index],[arr]),[initVal]) // Reduce the values of an array to a single value (going right-to-left)

reverse() // Reverses the order of the elements in an array

shift() // Removes the first element of an array, and returns that element

slice([start],[end]) // Selects a part of an array, and returns the new array

some(function(currentval,[index],[arr]),[thisVal]) // Checks if any of the elements in an array pass a test

sort([compareFunc]) // Sorts the elements of an array

splice(index,[quantity],[item1,...]) // Adds/Removes elements from an array

toString() // Converts an array to a string, and returns the result

unshift(item1,...) // Adds new elements to the beginning of an array, and returns the new length

valueOf() // Returns the primitive value of an array

Array:

.length - Property that represents the number of elements in an array.

.concat() - Joins two or more arrays and returns a new array.

.indexOf() - Returns the index of the first occurrence of a specified element.

.lastIndexOf() - Returns the index of the last occurrence of a specified element.

.push() - Adds one or more elements to the end of an array.

.pop() - Removes the last element from an array.

.shift() - Removes the first element from an array.

.unshift() - Adds one or more elements to the beginning of an array.

.slice() - Extracts a portion of an array into a new array.

.splice() - Changes the contents of an array by removing or replacing existing elements.

.forEach() - Calls a function for each element in an array.

.map() - Creates a new array with the results of calling a provided function on every element.

.filter() - Creates a new array with elements that pass a test.

.reduce() - Applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single value.

const data = Array(10).fill().map((v, i) => ({id: i + 1}));

    const fns = [()=>{console.log("first")}, ()=>{console.log("second")}, function(){console.log("third")}]

​

fns[0]();

/*remember the (), the function will not execute with only fns[0]*/

let sampleData = Array.from({length: 10}, (_, id) => ({id}))