index of array item code example
Example 1: get index of element in array js
const beasts = ['ant', 'bison', 'camel', 'duck', 'bison'];
console.log(beasts.indexOf('bison'));
console.log(beasts.indexOf('bison', 2));
console.log(beasts.indexOf('giraffe'));
Example 2: index of value in array
var imageList = [
{value: 100},
{value: 200},
{value: 300},
{value: 400},
{value: 500}
];
var index = imageList.findIndex(img => img.value === 200);
Example 3: how to get the index of an array in javascript
search = (arr, item) => { return arr.indexOf(item); }
Example 4: 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 ${indexOfFirst}`);
console.log(`The index of the 2nd "${searchTerm}" is ${paragraph.indexOf(searchTerm, (indexOfFirst + 1))}`);