const coding = ["js", "ruby", "java", "python", "cpp"]
coding.forEach( function (val){
console.log(val);
} )
coding.forEach( (item) => {
// console.log(item);
} )
function printMe(item){
// console.log(item);
}
Console Output:
js
ruby
java
python
cpp
const coding = ["js", "ruby", "java", "python", "cpp"]
coding.forEach( (item, index, arr)=> {
console.log(item, index, arr);
} )
Console Output:
js 0 [ 'js', 'ruby', 'java', 'python', 'cpp' ]
ruby 1 [ 'js', 'ruby', 'java', 'python', 'cpp' ]
java 2 [ 'js', 'ruby', 'java', 'python', 'cpp' ]
python 3 [ 'js', 'ruby', 'java', 'python', 'cpp' ]
cpp 4 [ 'js', 'ruby', 'java', 'python', 'cpp' ]
const myCoding = [
{
languageName: "javascript",
languageFileName: "js"
},
{
languageName: "java",
languageFileName: "java"
},
{
languageName: "python",
languageFileName: "py"
},
]
myCoding.forEach( (item) => {
console.log(item.languageName);
} )
Console Output:
javascript
java
python
const myNums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
myNums.forEach( (num) => {
if (num > 4) {
newNums.push(num)
}
} )
Console Output:
[
5, 6, 7, 8, 9,
10, 5, 6, 7, 8,
9, 10
]
const books = [
{ title: 'Book One', genre: 'Fiction', publish: 1981, edition: 2004 },
{ title: 'Book Two', genre: 'Non-Fiction', publish: 1992, edition: 2008 },
{ title: 'Book Three', genre: 'History', publish: 1999, edition: 2007 },
{ title: 'Book Four', genre: 'Non-Fiction', publish: 1989, edition: 2010 },
{ title: 'Book Five', genre: 'Science', publish: 2009, edition: 2014 },
{ title: 'Book Six', genre: 'Fiction', publish: 1987, edition: 2010 },
{ title: 'Book Seven', genre: 'History', publish: 1986, edition: 1996 },
{ title: 'Book Eight', genre: 'Science', publish: 2011, edition: 2016 },
{ title: 'Book Nine', genre: 'Non-Fiction', publish: 1981, edition: 1989 },
];
let userBooks = books.filter( (bk) => bk.genre === 'History')
userBooks = books.filter( (bk) => {
return bk.publish >= 1995 && bk.genre === "History"
})
console.log(userBooks);
Console Output:
[
{
title: 'Book Three',
genre: 'History',
publish: 1999,
edition: 2007
}
]
const myNumers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
// const newNums = myNumers.map( (num) => { return num + 10})
const newNums = myNumers
.map((num) => num * 10 )
.map( (num) => num + 1)
.filter( (num) => num >= 40)
console.log(newNums);
Initial Array: myNumers contains the values [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]. First .map(): This method multiplies each element of the array by 10. Example: 1 * 10 = 10, 2 * 10 = 20, etc. Resulting array after this step: [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]. Second .map(): After multiplying by 10, this second map adds 1 to each element. Example: 10 + 1 = 11, 20 + 1 = 21, etc. Resulting array: [11, 21, 31, 41, 51, 61, 71, 81, 91, 101]. .filter(): This filters out elements that are less than 40. After filtering, the array will only include elements that are >= 40. Resulting array: [41, 51, 61, 71, 81, 91, 101].
Console Output:
[
41, 51, 61, 71,
81, 91, 101
]