Today, We want to share with you JavaScript Array Methods tips, tricks and examples.In this post we will show you javascript declare empty array, hear for javascript array methods we will give you demo and example for implement.In this post, we will learn about javascript array of objects with an example.
JavaScript Array Methods tips, tricks and examples
There are the Following The simple About JavaScript Array Methods tips, tricks and examples Full Information With Example and source code.
As I will cover this Post with live Working example to develop javascript array length, so the javascript object for this example is following below.
Javascript Arrays
JavaScript Array Literal
var maganth=[]; // blank Array
JavaScript Array Constructor
var maganth=new Array(); // blank Array
Check Array datatype
var x=[]; typeof x; // return "object" Array.isArray(x); // return true
Traversal values of array
var members=["sanjay","magan","tulshi"]; members[0]; return "sanjay"; members[1]; return "magan"; members[2]; return "tulshi"; members[3]; return undefined;
array.length
var x=[]; var y=["jan","feb","mar"]; x.length; return 0; y.length; return 3;
Array length is mutable
var members=["sanjay","magan","tulshi"]; members.length; //return 3 members.length=5; members.length; //return 5 members //return ["sanjay","magan","tulshi",,] 2 empty members.length=6; members.length; //return 6 members //return ["sanjay","magan","tulshi",,,] 3 empty
Array Methods
sort()
var members=["sanjay","magan","tulshi","weds","thakrshi","farendo","shailesh"]; members.sort(); members // return ["farendo", "magan", "shailesh", "sanjay", "thakrshi", "tulshi", "weds"]
sort numeric array in alphabetical order
var i=[1,2,3,10,20]; i.sort(); i; return [1,10,2,20,3];
Sort numeric array
var i=[1,2,3,10,20]; function srt(a,b){ retrun a-b } i.sort(srt); i; return [1,2,3,10,20];
array.reverse()
var members=["sanjay","magan","tulshi","weds","thakrshi","farendo","shailesh"]; members.reverse(); members; // ["shailesh", "farendo", "thakrshi", "weds", "tulshi", "magan", "sanjay"]
indexOf()
var members=["sanjay","magan","tulshi","weds","thakrshi","farendo","shailesh"]; members.indexOf("sanjay"); // return 0 members.indexOf("shailesh"); // return 6 members.indexOf("SUN"); // return -1
shift
var members=["sanjay","magan","tulshi"]; members.shift(); // return "sanjay" members; //return ["magan","tulshi"]
unshift
var members=["sanjay","magan","tulshi"]; members.unshift("DAYS"); // return 4 members; //return ["DAYS","sanjay","magan","tulshi"]
array.pop()
var members=["sanjay","magan","tulshi"]; members.pop(); // return "tulshi" members; //return ["sanjay","magan"]
array.push()
var members=["sanjay","magan","tulshi"]; members.push("weds"); // return 4 members; //return ["sanjay","magan","tulshi","weds"]
array.splice()
var members=["sanjay","magan","tulshi"]; members.splice(0,1); // remove 1 element from 0 index members // return ["magan","tulshi"]; members.splice(1,1); // remove 1 element from 1 index members // return ["sanjay","tulshi"]; members.splice(0,2); // remove 2 element from 0 index members // return ["tulshi"]; members.splice(0,0,"members"); // add 1 element at 0 index members // return ["members","sanjay","magan","tulshi"]; members.splice(0,1,"members"); // add 1 element by removing element at 0 index members // return ["members","magan","tulshi"];
array.slice()
var members=["sanjay","magan","tulshi"]; members.slice(0); return ["sanjay","magan","tulshi"]; members.slice(1); return [magan","tulshi"]; members.slice(2); return ["tulshi"]; members.slice(1,3); return ["magan","tulshi"];
array.join()
var members=["sanjay","magan","tulshi"]; members.join(); return "sanjay,magan,tulshi"; members.join(":"); return "sanjay:magan:tulshi"; members.join("-"); return "sanjay-magan-tulshi";
array.concat()
var members1=["sanjay","magan","tulshi"]; var members2=["weds","thakrshi","farendo","shailesh"]; var members=members1.concat(members2); members; // return ["sanjay","magan","tulshi","weds","thakrshi","farendo","shailesh"]
split, string to array
var str="abc,efg"; str=str.split(""); // return ["a","b","c",",","e","f","g"] str=str.split(","); // return ["abc","efg"]
Multidimensional Array
var members=[["g1","g2","g3"],["b1","b2","b3","b4"]]; members.length; // 2 arrays in array members[0]; // first array in members members[1]; // second array in members members[0].length // 3 members[1].length // 4 members[0][0]; // "g1" members[0][1]; // "g2" members[0][2]; // "g3" members[1][0]; // "b1" members[1][1]; // "b2" members[1][2]; // "b3" members[1][3]; // "b4"
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