Lodash - Find item index from array by searching from the end

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To find the item index from an array that searches from the array end or from right to left, you can use the lodash method - _.findLastIndex.

var subjects = [
    { 'name': 'Math', 'score': 70 },
    { 'name': 'Physics', 'score': 80 },
    { 'name': 'Chemistry', 'score': 80 },
    { 'name': 'English', 'score': 90 }
];

//It starts searching items from end
// Find index where subject name is Chemistry
const physics_index = _.findLastIndex(subjects, function (item) {
    return item.name == 'Physics'; 
});
console.log("Physics index is : " + physics_index);
// => 1

//Find Index where score is 80
const score_index = _.findLastIndex(subjects, ['score', 80]);
console.log(score_index);
//=> 2

_.findLastIndex() Lodash

_.findLastIndex(Array, Predicate, FromIndex=Array.length-1)

Parameters Information

Array: [Required].

Predicate: [Required] - a function that invokes each iteration.

FromIndex:[Optional] Index value from where you want to start the search for the item. Default value is Array.length-1.

The iterstion starts from right to left and the function returns index if it find the item or returns -1.

Example Demo

Search Index Data (The code snippet can also be found with below search text)

_.findLastIndex lodash

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