find element in array javascript
const simpleArray = [3, 5, 7, 15];
const objectArray = [{ name: 'John' }, { name: 'Emma' }]
console.log( simpleArray.find(e => e === 7) )
// expected output 7
console.log( simpleArray.find(e => e === 10) )
// expected output undefined
console.log( objectArray.find(e => e.name === 'John') )
// expected output { name: 'John' }javascript find
const inventory = [
{name: 'apples', quantity: 2},
{name: 'cherries', quantity: 8}
{name: 'bananas', quantity: 0},
{name: 'cherries', quantity: 5}
{name: 'cherries', quantity: 15}
];
const result = inventory.find( ({ name }) => name === 'cherries' );
console.log(result) // { name: 'cherries', quantity: 5 }js find value in array
const array1 = [5, 12, 8, 130, 44];
const found = array1.find(element => element > 10);
console.log(found);
// expected output: 12function search in javascript array
// function to search array using for loop
function findInArray(ar, val) {
for (var i = 0,len = ar.length; i < len; i++) {
if ( ar[i] === val ) { // strict equality test
return i;
}
}
return -1;
}
// example array
var ar = ['Rudi', 'Morie', 'Halo', 'Miki', 'Mittens', 'Pumpkin'];
// test the function
alert( findInArray(ar, 'Rudi') ); // 0 (found at first element)
alert( findInArray(ar, 'Coco') ); // -1 (not found)array search
/*
Arrays Methods [Search]
- indexOf(Search Element, From Index [Opt])
- lastIndexOf(Search Element, From Index [Opt])
- includes(valueToFind, fromIndex [Opt]) [ES7]
*/
let myFriends = ["Ahmed", "Mohamed", "Sayed", "Alaa", "Ahmed"];
console.log(myFriends);
console.log(myFriends.indexOf("Ahmed"));
console.log(myFriends.indexOf("Ahmed", 2));
console.log(myFriends.lastIndexOf("Ahmed"));
console.log(myFriends.lastIndexOf("Ahmed", -2));
console.log(myFriends.includes("Ahmed"));
console.log(myFriends.includes("Ahmed", 2));
if (myFriends.lastIndexOf("Osama") === -1) {
console.log("Not Found");
}
console.log(myFriends.indexOf("Osama"));
console.log(myFriends.lastIndexOf("Osama"));Copyright © 2021 Codeinu
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