Pipeline Operator

The pipeline operator <| pipes the value from an expression into a function. This allows any single-argument function to be written as:

function add2(num) => num + 2;

var result = add2 <| 6; // result = 8

This is equivalent to:

function add2(num) => num + 2;

var result = add2(6); // result = 8

Syntax

function <| expression

A common case for such syntactic sugar would be when chaining multiple functions.

function add2(n) => n + 2;

function mul2(n) => n * 2;

// without pipeline operator

var a = add2(mul2(mul2(add2(mul2(4)))));

var b = add2 <| mul2 <| mul2 <| add2 <| mul2 <| 4;

println(a); // 42

println(b); // 42