🔰closure

A closure

is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment).
gives you access to an outer function's scope from an inner function.
is created every time a function is created, at function creation time.

// • `clsr` closes over parameter `a`
//             ╭──clsr──╮
let sum = a => b => a + b ;

sum(3)(4),    // 7
sum(5)(-1),   // 4

Last updated 2 years ago

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