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An arrow function doesn’trequire thefunction keyword, or curly braces, or a return statement. However, arrow functions do require a new operator, =>, which looks like an arrow pointing to the right, and which gives these expressions their name. To build an arrow function for adding two numbers, one simply has to write the following. let add = (x,y) => x + y; On the left-hand side of the arrow is the parameter list for the function. In this example there are two parameters,xandy. To the right of the arrow is the executable code for the function.

With destructuring, configuration options and defaults become more explicit. let httpPost = function(url, { cache = true, contentType = "application/json", timeout = 2500, headers = {}, // ... }) { // ... }; Template Literals Template literals provide JavaScript with string formatting capabilities. Like many template technologies, templates in JavaScript consist of literal text, and placeholders where the runtime can evaluate an expression and substitute data into the literal text. "); Backtickcharacters (`) enclose the entire template literal, while$and{} denote the substitution placeholders.

Another option is to make a copy of the array. Even if a caller changes the copy, the original student array remains safe. However, copy operations can be expensive. With ES2015, the classroom can now provide access to the student names without handing out access to the underlying array. iterator method. First, let’s make the classroom iterable by building our own iterator objects. This is the hard way to solve the problem, and we’ll see easier approaches after covering a few more topics. iterator needs square brackets to surround the method name.

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