/
arraymethod.html
228 lines (214 loc) · 5.57 KB
/
arraymethod.html
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<script>
let arr=["my","name","is","tony"];
delete arr[1];
alert(arr);
alert(arr.length);
arr.splice(1,1);
alert(arr);
alert(arr.length);
for(let i=0;i<arr.length;i++){
//arr+=arr[i];
alert(arr[i]);
}
alert(arr);
arr.splice(0,3,"let s","dance");
alert(arr);
let removed=arr.slice(1,3);
alert(removed);
alert(arr);
alert(arr.length);
alert()
alert(arr.splice(0,2));
let removed=arr.splice(0,2);
alert(removed);
let array=["i","am","learning","javascript es6"];
array.splice(2,0,"advanced");
alert(array);
let arr1=[1,2,3,4];
arr1.splice(-1,0,3,4);
alert(arr1);
let arr1=[1,2,3,4]
arr1.splice(-1,0,3,4);
alert(arr1);
let str="test";
let arr1=str.split("");
alert(arr1);
alert(typeof(arr1));
let arr1=["t","e","s","t"];
alert(str.slice())
alert(str.slice(-2));
alert(arr1.reverse());
alert(arr1.slice(-2));
alert(arr1.concat([4,4]));
let arr1=[1,2,3,4];
alert(arr1.concat[5,6,7]);
alert(arr1.concat[3,4],[8,14]);
alert(arr1.concat[7,8],9,10);
let arraylike={
name:"koushik",
[Symbol.isConcatSpreadable]: true,
age:27
};
alert(arr1.concat(arraylike));
["india","germany","usa","uk"].forEach(alert);
["india","germany","usa","uk"].forEach((item,index,array)=>{
alert(`${item} is at index ${index} in ${array}`);
});
["westbengal","odisha","andhra pradesh",""].forEach((item,index,array)=>{
alert(`${item} is at index ${index} in ${array}`);
});
alert(arr.indexOf(0));
alert(arr.indexOf(-1));
alert(arr.indexOf(false));
alert(arr.indexOf(null));
alert(arr.includes(1));
const arr=[NaN];
alert(arr.indexOf(NaN));
alert(arr.includes(NaN));
{id:1,name:"koushik"},
{id:2,name:"tony"},
{id:3,name:"stark"},
{id:4,name:"james"}
];
let user=users.find(item=>item.id===1);
let user1=users.find(users=>users.id===1);
alert(`name of the user is: ${user1.name}`);
const someUsers = users.filter(user => user.id < 3);
alert(someUsers);
const map1=num.map(i=>i*2);
alert(map1);
var roots = numbers.map(function(num) {
return Math.sqrt(num)
});
let add=num.map(i=>i+4);
alert(Math.sqrt(add));
alert(add);
let length=["india","usa","uk","germany"].map(item=>item.length);
alert(length);
num.sort();
alert(num);
[1,2,3,44].sort(function(a,b){
alert(a+"<>"+b);
});
let arr=[1,2,3,4]
arr.sort(function(a,b){
return a+b;});
alert(arr);
arr.sort((a,b)=>a+b);
alert(arr);
alert(arr.reverse());
let name="tony stark arnok".split(',',4);
let arr=name.split(",");
for(let name of arr){
alert(`a message to: ${name}`);
}
alert(arr);
alert(name);
let str="test";
alert(str.split(';'));*/
let arr=[1,2,3,4].reduce(function(accumulater,currentValue,currentIndex,array)){
return accumulator+currentValue;
}
alert(arr);
let result=arr.reduce((sum,current)=>sum+current,0)
let result1=arr.reduce((accumulater,currentValue)=>accumulater+currentValue);
alert(result);
alert(result1);
let arr=[0, 1, 2, 3, 4].reduce( (accumulator, currentValue, currentIndex, array) => accumulator + currentValue );
alert(arr);
var sum = [{x: 1}, {x: 2}, {x: 3}].reduce(function (accumulator, currentValue) {
return accumulator + currentValue.x;
},initialValue)
alert(sum);
alert(typeof {});
alert(typeof[]);
alert(typeof(number));
alert(typeof(integer));
alert(Array.isArray({}));
alert(Array.isArray([]));
let arr=[0, 1, 2, 3, 4];
let arr1=arr.slice(0);
alert(arr1);
let arr = [5, 3, 8, 1];
let filtered = filterRange(arr, 1, 4);
alert( filtered ); // 3,1 (matching values)
alert( arr );
let arr = [5, 3, 8, 1];
filterRangeInPlace(arr,1,4);
alert(arr);
function copySorted(arr) {
return arr.slice().sort();
}
let arr = ["HTML", "JavaScript", "CSS"];
let sorted = copySorted(arr);
alert( sorted );
alert( arr );
let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 28 };
let users=["John","Pete","Mary"];
let Name=users.map(item=>item.name);
alert(Name);
let john = { name: "John", surname: "Smith", id: 1 };
let pete = { name: "Pete", surname: "Hunt", id: 2 };
let mary = { name: "Mary", surname: "Key", id: 3 };
let User = [ "john", "pete", "mary" ];
let usermapped=User.map(user=>({
fullname:`${User.name}${User.surname}`,
id:User.id
}));
alert(usermapped[0].id);
alert(usermapped[0].fullname);
function sortage(arr){
arr.sort((a,b)=>a.age>b.age?a.age:-b.age);
}
let john = { name: "John", age: 28 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 25 };
let arr = [ pete, john, mary ];
sortage(arr);
alert(arr[0].name);
alert(arr[1].name);
alert(arr[2].name);
alert(arr[3].name);
let arr=[1,2,3,4];
alert(shuffle(arr));
function shuffle(arr){
arr.sort(()=> Math.random()-0.5);
}
let arr=[1,2,3,4];
shuffle(arr);
alert(arr);*/
function getaverageage(arr){
arr.reduce((prev,currentValue)=>prev+currentValue.age,0)/arr.length;
}
let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 29 };
let user=["John","Pete","Mary"];
alert(getaverageage(user));
function getage(a,b,c){
user.reduce((prev,currentValue)=>prev+currentValue.age,0)/user.length;
return a.age+b.age+c.age/3;
}
let john = { name: "John", age: 25 };
let pete = { name: "Pete", age: 30 };
let mary = { name: "Mary", age: 29 };
let arr= ["John","Pete","Mary"];
alert(getage(arr));*/
function unique(arr){
let result=[];
for(let str of arr){
if(!result.includes(str))
{
result.push(str);
}
}
return result;
}
let string=["tony","arnok","hulk","tony","harry","harry"];
alert(unique(string));
let arr = [5, 2, 1, -10, 8];
arr.sort((a,b)=>a-b);
alert(arr);
</script>