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add 5.4 array

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This commit is contained in:
mhrooz 2024-06-16 21:02:11 +02:00
parent 78ebe07977
commit e937deceea
2 changed files with 47 additions and 0 deletions
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12
5.4ArrayMethod/index.html Normal file
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script src="./t.js"></script>
</body>
</html>

35
5.4ArrayMethod/t.js Normal file
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array = ["Bilbo", "Gandalf", "Nazgul"];
array.forEach((item, index, array) =>{
console.log(`${item} is at index ${index} in ${array}`)
});
console.log(`arr.indexOf(Bilbo): ${array.indexOf("Bilbo")}`)
console.log(`arr.indexOf(Bilbo): ${array.includes("Bilbo")}`)
let fruits = ['Apple', 'Orange', 'Apple']
console.log(`fruits.indexOf('Apple'): ${fruits.indexOf('Apple')}`)
console.log(`fruits.lastIndexOf('Apple'): ${fruits.lastIndexOf('Apple')}`)
// arr.find(fn)
let users = [
{id: 1, name: "xingzhesun"},
{id: 2, name: "zhexingsun"},
{id: 3, name: "sunxingzhe"},
];
let user1 = users.find(item => item.id == 1);
let user2 = users.findLastIndex(item => item.id == 1);
console.log(user1.name);
console.log(user2.name);
// arr.filter
let someUsers = users.filter(user => user.id < 3);
console.log(someUsers)
someUsers = users.filter(function(item, index, array){
if (item.id < 3){
return true;
}
})
console.log(someUsers);
// arr.map(fn)