Note that => is written with an equal sign and a greater-than sign, both common programming symbols and pretty accessibly on a standard keyboard.
As for why, the top reasons I use arrow functions are:
1) Succinctness. If I'm trying to add 1 to each element in listOfNumbers, the old way to do it was:
2) Lexical context. When you write function, it creates its own this binding (that is, inside of a classic function, the this keyword refers to the function itself). But for arrow functions, this refers to the same thing both inside and outside the function; arrow functions don't create a lexical context. This is occasionally handy when I have some data in this that I need to use throughout a function, including in various predicates (like in functions passed to Array.map or async callbacks).
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Note that
=>
is written with an equal sign and a greater-than sign, both common programming symbols and pretty accessibly on a standard keyboard.As for why, the top reasons I use arrow functions are:
1) Succinctness. If I'm trying to add 1 to each element in
listOfNumbers
, the old way to do it was:With an arrow function I can do
Which is quicker to write and quicker to read.
2) Lexical context. When you write
function
, it creates its ownthis
binding (that is, inside of a classic function, thethis
keyword refers to the function itself). But for arrow functions,this
refers to the same thing both inside and outside the function; arrow functions don't create a lexical context. This is occasionally handy when I have some data inthis
that I need to use throughout a function, including in various predicates (like in functions passed toArray.map
or async callbacks).