JSFiddle - React, Tailwind, and code Playground

JavaScript

var item1 = {item: "item1"},
    array = [{
        item: "item1"},{
        item: "item_non"},{
        item: "item1"},{
        item: "item_non"},{
        item: "item1"},{
        item: "item1"},{
        item: "item1"},{
        item: "item_non"},{
        item: "item_non"
    }];
array.forEach(function(items){
    if(item1.item === items.item){
        console.log(items)
        var index = array.indexOf(items);
        if(index !== -1){
            console.log("slicing");
            array.splice(index,1);
        }
    }
});

console.log(array);