The ES6 spread operator is a useful feature in JavaScript that allows you to expand an iterable (like an array or string) into individual elements. It is denoted by the … symbol and can be used in several different ways.
Here are some examples of how the spread operator can be used:
const arr1 = [1, 2, 3];
const arr2 = [4, 5, 6];
const arr3 = [...arr1, ...arr2];
console.log(arr3); // [1, 2, 3, 4, 5, 6]
In this example, we’re using the spread operator to concatenate two arrays (arr1 and arr2) into a new array (arr3). By using the spread operator, we’re able to avoid using concat or other array manipulation methods.
const arr1 = [1, 2, 3];
const arr2 = [...arr1];
console.log(arr2); // [1, 2, 3]
In this example, we’re using the spread operator to create a new array (arr2) that is a copy of an existing array (arr1). This is useful when you want to create a copy of an array without modifying the original.
const obj1 = { foo: 'bar', baz: 'qux' };
const obj2 = { bar: 'foo', qux: 'baz' };
const obj3 = { ...obj1, ...obj2 };
console.log(obj3); // { foo: 'bar', baz: 'qux', bar: 'foo', qux: 'baz' }
In this example, we’re using the spread operator to merge two objects (obj1 and obj2) into a new object (obj3). By using the spread operator, we’re able to create a new object that contains all the properties from both objects.
function myFunction(x, y, z) {
console.log(x, y, z);
}
const arr = [1, 2, 3];
myFunction(...arr); // 1 2 3
In this example, we’re using the spread operator to pass an array (arr) as arguments to a function (myFunction). By using the spread operator, we’re able to avoid using apply or other function invocation methods.
Overall, the ES6 spread operator is a powerful feature in JavaScript that can help simplify your code and make it easier to work with arrays and objects.
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