Javascript copy array #javascript #js #es6

copy_array.js

// slice method
var sandwiches = ['turkey', 'tuna', 'chicken salad', 'italian', 'blt', 'grilled cheese'];

// ['chicken salad', 'italian', 'blt', 'grilled cheese']
var fewerSandwiches = sandwiches.slice(2);

// ['chicken salad', 'italian', 'blt']
var fewerSandwiches2 = sandwiches.slice(2, 4);

// ['italian', 'blt', 'grilled cheese']
var sandwichesFromTheEnd = sandwiches.slice(-3);

var sandwichesCopy = sandwiches.slice();

// ES6 from method
var sandwiches = ['turkey', 'tuna', 'chicken salad', 'italian', 'blt', 'grilled cheese'];

// ['turkey', 'tuna', 'chicken salad', 'italian', 'blt', 'grilled cheese']
var sandwichesCopy = Array.from(sandwiches);

// (6) ['TURKEY', 'TUNA', 'CHICKEN SALAD', 'ITALIAN', 'BLT', 'GRILLED CHEESE']
var sandwichesUppercase = Array.from(sandwiches, function (sandwich) {
	return sandwich.toUpperCase();
});