1const myClonedArray  = Object.assign([], myArray);

1var tempArray = JSON.parse(JSON.stringify(mainArray));
2

1const sheeps = ['Apple', 'Banana', 'Juice'];
2
3// Old way
4const cloneSheeps = sheeps.slice();
5
6// ES6 way
7const cloneSheepsES6 = [...sheeps];

1/* Copying arrays or parts of arrays in JavaScript */
2
3var fruit = ["apple", "banana", "fig"]; // Define initial array.
4console.log(fruit); // ["apple", "banana", "fig"]
5
6// Copy an entire array using .slice()
7var fruit2 = fruit.slice(); 
8console.log(fruit2); // ["apple", "banana", "fig"]
9
10// Copy only two array indicies rather than all three
11// From index 0 (inclusive) to index 2 (noninclusive)
12var fruit3 = fruit.slice(0,2); 
13console.log(fruit3); // ["apple", "banana"]
14

1// this is for array with complex object
2var countries = [
3  {name: 'USA', population: '300M'}, 
4  {name: 'China', population: '1.6B'}
5];
6
7var newCountries = JSON.parse(JSON.stringify(countries));
8

1const myClonedObject = Object.assign({}, myObject);