The JavaScript path operator ( |> ) is used to pass the value of an expression to a function. This operator makes string functions easier to read. This function is called the operator ( |> ), and any value used on the pipe operator is passed as an argument to the function. Functions are placed in the order they operate on arguments.
Syntax:
expression |> function
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Using the Pipeline Operator: Since the Pipeline Operator is an experimental feature and currently in a phase 1 proposal, there is no support for existing browsers and is therefore not included in Node. However, one can use Babel (JavaScript Compiler) to use it.
Steps:
- Before moving ahead, make sure that Node.js is installed.
- Create a directory on your desktop (say pipeline-operator) and within that directory create a JavaScript file (say main.js).
- Navigate to the directory and initialize the package.json file containing relevant information about the project and its dependencies.
npm init
- Install Babel to use the operator. The path operator is not currently part of the JavaScript language, babel is used to compile code to Node.
npm install @babel/cli @babel/core @babel/plugin-proposal-pipeline-operator
- To direct babel about the compilation of the code properly, a file named .babelrc is created with the following lines:
{ "plugins": [ [ "@ babel/plugin-proposal-pipeline-operator", { "proposal" : "minimal" } ] ] }
- Add a start script to package.json file which will run babel:
"start" : "babel main.js --out-file output.js && node output.js"
- Run the code:
npm start
Example:
Javascript
// JavaScript Code (main.js)  function add(x) {     return x + 10; }  function subtract(x) {     return x - 5; }  // Without pipeline operator let val1 = add(subtract(add(subtract(10)))); console.log(val1);  // Using pipeline operator  //first 10 is passed as argument to subtract
//function then return value is passed to //add function then the value we get is passed to //subtract and then value what we get is again // passed to add function let val2 = 10 |> subtract |> add |> subtract |> add; console.log(val2); |
Output:
20 20
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