is there a function in lodash to replace matched item

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In your case all you need to do is to find object in array and use Array.prototype.splice() method, read more details here:

var arr = [{id: 1, name: "Person 1"}, {id:2, name:"Person 2"}];

// Find item index using _.findIndex (thanks @AJ Richardson for comment)
var index = _.findIndex(arr, {id: 1});

// Replace item at index using native splice
arr.splice(index, 1, {id: 100, name: 'New object.'});

// "console.log" result
document.write(JSON.stringify( arr ));
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/2.4.1/lodash.min.js"></script>

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