JAVASCRIPT

.indexof()

// Random Quotes.
const Quotes = [
  "The purpose of our lives is to be happy.",
  "Life is what happens when you're busy making other plans.",
  "Get busy living or get busy dying.",
  "You only live once, but if you do it right, once is enough.",
  "Many of life's failures are people who did not realize how close they were to success when they gave up.",
  "If you want to live a happy life, tie it to a goal, not to people or things.",
  "Never let the fear of striking out keep you from playing the game.",
  "Money and success don't change people; they merely amplify what is already there."];
var num = Quotes.length;
let Dayof = Math.floor(Math.random() * num); //Randome Number Generated With Random Function.
QuoteofDay = Quotes[Dayof];
console.log("Quote Of The Day :", QuoteofDay);
console.log(": You Wont To Enter A New Quote :");
let Yn = prompt("Enter Y Or N To Cancel :");
const Y = "y";
if (Y == Yn) {
  let newQuotes = prompt("Enter New Quotes to Add :");
  Quotes.push(newQuotes); // .push() Method Used To Add New Value In A Array.
  let check = Quotes.indexOf(newQuotes); //.indexof() is used To Check Possition Off Entered Value.
  if (newQuotes == "") {
    console.log(": Blank Value Is Not Allowed :");
    console.log(": To Enter Agen Refresh The Page :");
  }
  else if (newQuotes == Quotes[check]) {
    console.log(" You Entered Quote Is :", newQuotes);
    console.log(": New Quote Updated Sucessfully :");
  }
  else {
    console.log(": Error 404! Refresh And Tray Agen  :");
  }
}
else {
  console.log(" : Thak You !:")
}

javascript indexof with condition

a = [
  {prop1:"abc",prop2:"qwe"},
  {prop1:"bnmb",prop2:"yutu"},
  {prop1:"zxvz",prop2:"qwrq"}
];
    
index = a.findIndex(x => x.prop2 ==="yutu");

console.log(index);

indexof javascript

var str = "Please locate where 'locate' occurs!";

var ind1 = str.indexOf("locate"); // return location of first value which founded
var ind2 = str.lastIndexOf("locate"); // return location of last value which founded
var ind3 = str.indexOf("locate", 15); // start search from location 15 and then take first value which founded
var ind4 = str.search("locate");
//The search() method cannot take a second start position argument. 
//The indexOf() method cannot take powerful search values (regular expressions).

document.write("<br>" + "Length of string:", len);
document.write("<br>" + "indexOf:", ind1);
document.write("<br>" + "index of last:", ind2);
document.write("<br>" + "indexOf with start point:", ind3);
document.write("<br>" + "search:", ind4);

indexOf

/*To search for the index of a substring or string within an array, 
use .indexOf() 
If you search for something that isn't there, the function will return -1*/

let mechs = ["madcat", "blood asp", "atlas"];
console.log(mechs.indexOf("madcat"); //returns 0
console.log(mechs.indexOf("atlas"); //returns 2

let clan = "nova cat";
console.log(clan.indexOf("a")); /*returns 3 (Only the first instance of the
character is used.*/
console.log(clan.indexOf("cat")); /*returns 5 (Finds the index of the beginning
character)*/
console.log(clan.indexOf("s")); //returns -1

js indexof string

const paragraph = 'The quick brown fox';

console.log(paragraph.indexOf('T'));
>> 0

console.log(paragraph.indexOf('h'));
>> 1

console.log(paragraph.indexOf('Th'));
>> 0

console.log(paragraph.indexOf('he'));
>> 1

console.log(paragraph.indexOf('x'));
>> 18

indexOf

let str = "Please locate where 'locate' occurs!";
str.indexOf("locate");

//it will returns the index of (the position of) the first occurrence of a specified text in a string:
// >> 7

//if you find this answer is useful ,
//upvote ⇑⇑ , so can the others benefit also . @mohammad alshraideh ( ͡~ ͜ʖ ͡°)

index of javascript

//indexOf()
const arr2 = [1,2,567,4,5]
//Below the indexOf searches for the value '567'
const findIndexOfValue567 = arr2.indexOf(567);
//this is then returned as an index
console.log(findIndexOfValue567)
//if the argument you place in the method is not there...
const isThisValueThere = arr2.indexOf(989);
//then a value of -1 is returned
console.log(isThisValueThere)

indexof js

const fruits = ["apple", "banana", "cantaloupe", "blueberries", "grapefruit"];

const index = fruits.findIndex(fruit => fruit === "blueberries");

console.log(index); // 3
console.log(fruits[index]); // blueberries

.index of javascript

let monTableau = ['un', 'deux','trois', 'quatre'] ;
console.log(monTableau.indexOf('trois')) ;
 

js indexof string

str.indexOf(searchValue[, fromIndex])

indexof javascript

Array.indexOf(searchElement, fromIndex)

make indexOF in js

function indexOf(arr, value) {
  for (let [i, e] of arr.entries()) {
    if (value == e) return i;
  }
  return -1;
}
indexOf([1,2,3], 2);                     //returns 1

indexof javascript

arr.indexOf(searchElement[, fromIndex])

indexOF

public int indexOf(int value)
    {
        int index = -1;
        for (int i = 0; i < size; i++)
        {
            if (elementData[i] == value)
            {
                index = i;
            }
        }
        return index;
    }

.indexof() in javascript

var str = "We got a poop cleanup on isle 4.";
var strPos = str.indexOf("5");//9

js index of

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log(`The index of the first "${searchTerm}" from the beginning is ${indexOfFirst}`);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log(`The index of the 2nd "${searchTerm}" is ${paragraph.indexOf(searchTerm, (indexOfFirst + 1))}`);
// expected output: "The index of the 2nd "dog" is 52"

Indexof method javascript

// indexOf method only requires a single value 
// and returns the index of the FIRST value found in array
const cities = [
  "Orlando",
  "Dubai",
  "Denver",
  "Edinburgh",
  "Chennai",
  "Accra",
];

console.log(cities.indexOf("Chennai"));
// expected output is 4