typescript - Why changing "const" value in Angular 2 does not give error? -

-

the code simple:

const num = 1; num = 2; console.log('num', num);

in jsfiddle, browser console show following error, great:

uncaught typeerror: assignment constant variable.

however, same codes in angular 2 not give error, , @ end num equals 2. see plunker.

why changing "const" value in angular 2 not give error? bug? thanks

online typescript compiler default target lower 'es6', in generated code const replaced var compatibility, if change config.js to:

  typescriptoptions: {     emitdecoratormetadata: true,     target: 'es6'   }

compiler output const , you'll see error.


Comments

Post a Comment

Popular posts from this blog

html - Styling progress bar with inline style -

-
i trying set progress bar color red using inline style. need in way because have access <body> part of document. style need apply: progress { color: red } progress::-moz-progress-bar { background: red;} progress::-webkit-progress-value { background: red; } progress[aria-valuenow]:before { background: red; } i tried <progress style="background: red;"> incorrect effect, progress bar color turns blue red background. guide right direction desired style? thank in advance. here live example: https://jsfiddle.net/z36d3f6l/
Read more

java - Oracle Sql developer error: could not install some modules -

-
i have downloaded fresh copy of sqldeveloper ( sqldeveloper-4.1.3.20.78-no-jre ) oracle website. when unzip , lauch gui, keep getting following error message: warning - not install modules: dynamic module config - no module providing capability org.netbeans.netbinox found. my system: windows 7 32 bit hp probook. jdk 1.6 , 1.7, 1.8 available in java/jdk subdirectory. netbeans 8.0.2 installed finally got way out after dirty hours. extracted sqldeveloper zip in nested directory. i.e: e://a/b/c/sqldeveloper. starting sqldeveloper gui above directory threw erros. solution: go in c:\users**username**\appdata\roaming : delete sql developer , sqldeveloper folders extract sql developer zip in new non nested directory. i.e: e:// start , should work now reference: https://community.oracle.com/thread/3870680?start=0&tstart=0
Read more

How to use autoclose brackets in Jupyter notebook? -

-
this may sound silly question, how make use of autoclose brackets in jupyter notebook? example, when type print( jupyter notebook auto-closes brakets print() and places cursor inside. type argument, say print(1 + 1) now cursor between second 1 , right bracket ) . key navigate right of ) ? of course can press end or → or ) achieve this, not seem save time, purpose of brackets autoclose suppose? thanks in advance.
Read more