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The first difference between the normal function and arrow function … Syntactically, the previous function can be … This function receives two parameters, … There are more than 600 arrows in Unicode. converting this function declaration to an arrow function expression, 1:23. is almost exactly the same as our first example, except for one difference. If you want to understand why you can’t invoke an arrow function by putting parentheses immediately after it, you have to examine how expression bodies work: parentheses after an expression body should be part of the expression… Rewrite the sum function with arrow function syntax: const sum = (a, b) => { return a + b } Like traditional function expressions, arrow functions are not hoisted, and so you cannot call them before you declare them. The typescript handbook currently has nothing on arrow functions. Given how arrow functions work, the latter way of parenthesizing should be preferred from now on. In classic function expressions, the this keyword is bound to different values based on the context in which the function is called. Isn’t the arrow function already an expression by default?! Do you know what it is? 1:33. An arrow function expression is a compact alternative to a traditional function expression, but is limited and can’t be used in all situations. Differences & Limitations: Does not have its own bindings to this or super, and should not be used as methods. 1:30. 4.2 Arrow function. So it sounds like a compact alternative, which means that it’s shorter and simpler compared to the traditional function syntax. I was about to dispute you @slebetman on technicality, since this is a (arrow) function expression and you end up with a named function (ie foo.name === 'foo').But only because it's in the initializer of a const *statement*—meaning it's not quite right to call this a "named async arrow function expression". These are the inline arrows function. 1:26. and this is the Kyle Simpson's answer: an arrow function is an expr, but we need surrounding parens b/c of "operator precedence" (sorta), so that the final parens to invoke the arrow-IIFE apply to the entire function and not to just the last token of its body. You're also correct that a named function expression's name is only bound inside … An arrow function expression is a compact alternative to a traditional function expression, but is limited and can't be used in all situations. Arrow functions and this. If the arrow function contains one expression, and you omit the function’s curly braces, then the expression is implicitely returned. They have different functions and play different roles. You can return values from the arrow function the same way as from a regular function, but with one useful exception. Syntax and usage: Arrow functions in ES6 allow you to remove some of that syntax along with refining how to handle ‘this’. An arrow function looks similar to a function expression — it’s just shorter. The syntax of the arrow function consists of zero or more parameters , an arrow => and then concludes with the function statements . Yep, you got it. Arrows in Unicode. An arrow function expression is an anonymous function expression written with the “fat arrow” syntax (=>). Again we assign an anonymous function to a named variable. ES6 added a new syntax for writing functions which is getting heavily used in today’s JavaScript world. 13.6.3 Parenthesizing arrow function with expression bodies #. Given how arrow functions work, the latter way of parenthesizing should preferred! With the function ’ s just shorter and you omit the function ’ s world. And should not be used as methods you to remove some of that syntax along refining... More parameters, an arrow = > ) bound to different values based on the context in which function! 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