JAVASCRIPT

javascript indexOf object value in array

// Get index of object with specific value in array
const needle = 3; // needle
const haystack = [{ id: 1 }, { id: 2 }, { id: 3 }]; // haystack
const index = haystack.findIndex(item => item.id === needle);

javascript get index of object in array

// Get index of object with specific value in array
const needle = 3;
const haystack = [{ id: 1 }, { id: 2 }, { id: 3 }];
const index = haystack.findIndex(item => item.id === needle);

get index of item array

const array = ['a', 'b', 'c']
array.indexOf('a')
 > 0

find the index of an object in an array

const letters = [{letter: 'a'},{letter: 'b'},{letter: 'c'}]

const index = letters.findIndex((element, index) => {
  if (element.letter === 'b') {
    return true
  }
})

//index is `1`

get index of element in array js

const beasts = ['ant', 'bison', 'camel', 'duck', 'bison'];

beasts.indexOf('bison'); //ouput: 1

// start from index 2
beasts.indexOf('bison', 2); //output: 4

beasts.indexOf('giraffe'); //output: -1

Get the index of an Object in an Array in JavaScript

const Season = [
  {
    month:'January',
    season: 'Winter',
  },
  {
    month:'March',
    season: 'Spring',
  },
  {
    month:'June',
    season: 'Summer',
  },
  {
    month:'August',
    season: 'Autumn',
  },
]

const index = Season.findIndex( (loopVariable) => loopVariable.month === 'March');
console.log("The index of March Month is",index)

js get index of item in array

array.indexOf("item");

Get the index of an Object in an Array in JavaScript

const Season = [
  {
    month:'January',
    season: 'Winter',
  },
  {
    month:'March',
    season: 'Spring',
  },
  {
    month:'June',
    season: 'Summer',
  },
  {
    month:'August',
    season: 'Autumn',
  },
]

const index = Season.map( (loopVariable) => loopVariable.month).indexOf
 ("March"));
console.log("The index of March Month is",index)

get the index of object in array

var elementPos = array.map(function(x) {return x.id; }).indexOf(idYourAreLookingFor);
var objectFound = array[elementPos];