tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

short-circuiting.js (597B)

      1 // Copyright 2019 Google, Inc.  All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 esid: prod-OptionalExpression
      5 description: >
      6  demonstrate syntax-based short-circuiting.
      7 info: |
      8  If the expression on the LHS of ?. evaluates to null/undefined, the RHS is
      9  not evaluated
     10 features: [optional-chaining]
     11 ---*/
     12 
     13 const a = undefined;
     14 let x = 1;
     15 
     16 a?.[++x] // short-circuiting.
     17 a?.b.c(++x).d; // long short-circuiting.
     18 
     19 undefined?.[++x] // short-circuiting.
     20 undefined?.b.c(++x).d; // long short-circuiting.
     21 
     22 assert.sameValue(1, x);
     23 
     24 reportCompare(0, 0);