Modify object property in an array of objects

Question

var foo = [{ bar: 1, baz: [1,2,3] }, { bar: 2, baz: [4,5,6] }];

var filtered = $.grep(foo, function(v){
    return v.bar === 1;
});

console.log(filtered);
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Answer 1

.map with spread (...) operator

var result = foo.map(el => el.bar == 1 ? {...el, baz: [11,22,33]} : el);