I add some strings in an array.
console.log(arr1); // ['product_1']
let arr2 = arr1.push(name);
console.log(arr2); // 2
Why I receive number 2 in the second log when name is a String too?
arr.push() modifies the arr itself and returns the length of the resulting array, to do what you want to do, you can do one of the two following methods
const name = "test";
arr1 = ['product_1'];
// Method 1
let arr2 = [...arr1, name]
console.log(arr2);
// Method 2
arr1.push(name);
console.log(arr1);The number 2 in this case is the length of your array.