Is Chrome's JavaScript console lazy about evaluating arrays? -

-

i'll start code:

var s = ["hi"]; console.log(s); s[0] = "bye"; console.log(s);

simple, right? in response this, firebug says:

["hi"] ["bye"]

wonderful, chrome's javascript console (7.0.517.41 beta) says:

["bye"] ["bye"]

have done wrong, or chrome's javascript console being exceptionally lazy evaluating array?

thanks comment, tec. able find existing unconfirmed webkit bug explains issue: https://bugs.webkit.org/show_bug.cgi?id=35801 (edit: fixed!)

there appears debate regarding how of bug , whether it's fixable. seem bad behavior me. troubling me because, in chrome @ least, occurs when code resides in scripts executed (before page loaded), when console open, whenever page refreshed. calling console.log when console not yet active results in reference object being queued, not output console contain. therefore, array (or object), not evaluated until console ready. case of lazy evaluation.

however, there simple way avoid in code:

var s = ["hi"]; console.log(s.tostring()); s[0] = "bye"; console.log(s.tostring());

by calling tostring, create representation in memory not altered following statements, console read when ready. console output different passing object directly, seems acceptable:

hi bye

Comments

Post a Comment

Popular posts from this blog

html - Cut text on left side inside button while centering -

-
i need have button text (f.e. "add basket") fluid in width. if button width little show "add basket" must cut "basket" only. did achieve of splitting <span class="text">add basket</span> into 2 parts , reverse order them in dom <span class="text">basket</span><span class="text text-prefix">add to&nbsp;</span> and show them in correct order adding .text{ float: right; } however, text inside button must centered, not work far. here fiddle, i'd appreciate ideas: https://jsfiddle.net/5cavrrhc/ under circumstances, want avoid using js this. solution ok, here go: https://jsfiddle.net/6etabchg/4/ ok, co-worker , found solution works nicely. make button position: relative make wrapper display: flex; flex-wrap: wrap-reverse; justify-content: center; reverse order make both inner spans display: inline-block;flex-shrink: 0; make 1 span should remain or...
Read more

What design pattern is this code in Javascript? -

-
this question has answer here: why write “.call(this)” @ end of javascript anonymous function? [duplicate] 4 answers what kind of design pattern , significance of using closure? (function(){ // code here }).call(this); edit then difference between above code , following this keyword still refer same object in both ways. (function(){ // code here })(); thats invoked function expression. more info here: http://benalman.com/news/2010/11/immediately-invoked-function-expression/ the purpose run code while protecting scope (so variables declared within don't leak out global scope. update call sets value of this function being applied on. without it, value set window object, there set outer scope.
Read more

java - Last square of 8x8 grid not drawn, using two nested FOR loops -

-
i'm having trouble understanding why code isn't working. should display checkerboard grid 8x8, but last square doesn't drawn ! idea why? i searched see if had been asked before, , didn't find anything. in advance! code: /* * file:checkerboard.java * ---------------------- */ import acm.graphics.*; import acm.program.*; public class checkerboard extends graphicsprogram { int row, column, x, y; public void run() { // checkerboard (row = 0; row < 8; row++) { (column = 0; column < 8; column++) { // x, y, x width, y width add(new grect(x, y, 50, 50)); x = column * 50; y = row * 50; } } } } btw: book i'm reading asks use 2 nested loops ( "the art , science of java" , chapter 4, exercise 11, cs-106a) you need set x , y before drawing rectangle. otherwise, last rectangle not going display: for (row = 0; row <...
Read more