To find the records in the array by using many ways like find, findBy, peekRecord refer [https://guides.emberjs.com/v3.14.0/models/finding-records/] lets look at a simple example:
array=[{name:"deepak"},{name:"aravind"},{name:"hari"}]
In this array you find the corresponding data by its property.
remove=this.array.findBy("name","deepak");
this.array.removeObject(remove);
This will remove the corresponding object from the mutable array.To remove the object is also have various methods. For more reference [https://medium.com/quangtn0018/ember-js-remove-objects-from-ember-mutable-arrays-f95192fbd0f0]
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