Array.findIndex() javascript code example
Example 1: find index of object in array javascript
a = [
{prop1:"abc",prop2:"qwe"},
{prop1:"bnmb",prop2:"yutu"},
{prop1:"zxvz",prop2:"qwrq"}];
index = a.findIndex(x => x.prop2 ==="yutu");
console.log(index);
Example 2: js find index in list
let myList = ['foo', 'bar', 'qux'];
myList.indexOf('bar'); // 1
Example 3: findindex js
// findIndex(callback fn)
// .... return index (when condition meets)
// .... return -1 (if condition not meets)
const array = [5, 12, 8, 130, 44];
/// it returns the index of number which satisfy the condition true
const index = array.findIndex((item)=> item>10); //1
/// now we can check what element at that index...
console.log(array[index]); // array[1]
Example 4: get the index of object in array
var elementPos = array.map(function(x) {return x.id; }).indexOf(idYourAreLookingFor);
var objectFound = array[elementPos];