array / javascript feature

# Web Site Writing Basics

# javascript

# array

Array features in JavaScript are special objects that store sequenced data sets that can store multiple types of data in the same variable, and each data has an index (index) that starts from\ (0\) to access them. Important features include length (\ (length\)) and methods that help to manage .rPeykc.rWIipd {font-size: var (--m3t5); font-weight: 500; line-height: var (--m3t6); margin: 20px 0 10px 0}. f5cPye {font-size: var (--m3t7); font-weight: 500; line-height: var (--m3t6); margin: 20px 0)). 20px 0; padding-inline-start: 24px} .f5cPye.. 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There are sequences: Data is stored sequentially and can be accessed through a numeric index. This starts from\ (0\). There is a length feature: It tells the amount of data in the array, which is automatically adjusted when the data is added or deleted. There are methods: There are many predefined methods for dealing with data in the array, such as increments. / Delete: push (), pop (), unshift (), splice () Search: find (), filter () Loop: forEach (), map () Sorting: sort () Array Translated - Summary Arrays are a special type of object suitable for storing and managing sorted data items. Declaration: / / square brackets (usual) let arr = [item 1, javascript.info Manage data sets with Array Methods in JavaScript | by jtk | InsightEra8 Mar. 2020 - Summary of array methods is what facilitates use. 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The .length property of an array in JavaScript is an integer number used to verify the total number of elements in an array. This property is a non-method property, so it does not require brackets () to access the value, and can be used to determine whether the array is empty or used as part of a loop to access all elements of the array.

Features and Applications

Returns the number of elements: .length returns an integer value that indicates how much data is in the array.

Access: You can access the value by writing the array name followed by .length, such as myArray.length

Blank Check: Use array.length = = = 0 to determine if the array is empty.

Use in loops: Can be used in conjunction with the for loop to iterate and access each element in the array.

Sample

JavaScript

const fruits = ['apple', 'banana', 'orange'];

Const numberOfFruits = fruit.length;

console.log (numberOfFruits); / / Output: 3

If (fruit.length = = = 0) {

console.log ('The array is empty.');

} else {

console.log ('The array is not empty.');

}

/ / Example of use in the loop

for (let i = 0; i < fruit.length; i + +) {

console.log (fruits [i]);

}

/ / Output:

/ / apple

/ / banana

/ / orange