Example 1: javascript ellipsis
function sum(x, y, z) {
return x + y + z;
}
const numbers = [1, 2, 3];
console.log(sum(...numbers));
// expected output: 6
console.log(sum.apply(null, numbers));
// expected output: 6
// ... can also be used in place of `arguments`
// For example, this function will add up all the arguments you give to it
function sum(...numbers) {
let sum = 0;
for (const number of numbers)
sum += number;
return sum;
}
console.log(sum(1, 2, 3, 4, 5));
// Expected output: 15
// They can also be used together, but the ... must be at the end
console.log(sum(4, 5, ...numbers));
// Expected output: 15
Example 2: ellipsis javascript
//example
function sum(x, y, z) {
return x + y + z;
}
const numbers = [1, 2, 3];
console.log(sum(...numbers));
// expected output: 6
Example 3: 3 dots to get all object properties in JS
this.setState(prevState => {
return {foo: {...prevState.foo, a: "updated"}};
});
Example 4: ellipses in js
//Example:
const numbers1 = [1, 2, 3, 4, 5];
const numbers2 = [ ...numbers1, 1, 2, 6,7,8];
// this will be [1, 2, 3, 4, 5, 1, 2, 6, 7, 8]