Section 1.1: The forEach() Method

The forEach() function allows you to traverse through an array and execute a callback function for each element. It's important to note that this method does not return any value.

For example, consider the following array of car brands:

const carBrands = ["mercedes", "audi", "tesla", "honda"];

carBrands.forEach(carBrand => {

console.log(carBrand);

});

// This will log each car brand to the console.

Section 1.2: The map() Method

The map() method iterates through an array, applying a callback function to each element, and produces a new array as output.

Here's how you can use it with an array of numbers:

const numbers = [1, 2, 3, 4, 5];

const new_numbers = numbers.map(number => {

return number * 2;

});

// This will return a new array: [2, 4, 6, 8, 10]

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Section 1.3: The filter() Method

The filter() method enables you to create a new array containing elements that meet a specific condition.

For instance, consider this array of flowers:

const flowers = ["rose", "lily", "lotus", "sunflower"];

const filtered_flowers = flowers.filter(flower => {

return flower.length <= 4;

});

// This will return: ["rose", "lily"]

Section 1.4: The reduce() Method

reduce() is a powerful method that condenses an array into a single value by executing a reducer function on each element.

Here's a simple example with numbers:

const numbers = [1, 2, 3, 4];

const sum = numbers.reduce((accumulator, currentValue) => {

return accumulator + currentValue;

});

// This will yield the sum of all elements: 10

Section 1.5: The slice() Method

The slice() method extracts a segment of an array without altering the original array.

For example:

const beverages = ["tea", "coffee", "milkshake", "red bull"];

const sliced_beverages = beverages.slice(1, 3);

// This results in: ["coffee", "milkshake"]

Section 1.6: The splice() Method

Unlike slice(), the splice() method modifies the original array by removing or replacing elements.

For example:

const alphabets = ["a", "b", "c", "d"];

alphabets.splice(2, 1, "x");

// The updated 'alphabets' array will be: ["a", "b", "x", "d"]

Section 1.7: The every() Method

The every() method checks if all elements in the array satisfy a particular condition, returning a boolean value.

Here's an example:

const numbers = [10, 20, 30, 40];

numbers.every(value => value < 100); // Returns true

numbers.every(value => value > 200); // Returns false

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