As of 1.0, for loops work with values of types with the Iterator trait. The book describes this technique in chapter 3.5 and chapter 13.2. If you are interested in how for loops operate, see the described syntactic sugar in Module std::iter. Example: fn main() { let strs = [“red”, “green”, “blue”]; for sptr in … Read more
For most purposes, you probably won’t notice a difference. However, foreach reads each line into a list (not an array) before going through it line by line, whereas while reads one line at a time. As foreach will use more memory and require processing time upfront, it is generally recommended to use while to iterate … Read more
var list = [1, 2, 3, 4, 5]; for (var i = 0, len = list.length; i < len; i += 1) { (function(i) { setInterval(function() { list[i] += 10; console.log(i + “=>” + list[i] + “\n”); }, 5000) })(i); } Here is the working code: var list = [1, 2, 3, 4, 5]; for … Read more
It’s actually much simpler than that: lw=(‘plugin1’ ‘plugin2’ ‘plugin3’) for i in $lw; do . ~/Library/Rogall/plugins/$i/lw.prg end done In summary: Assign to foo, not $foo (the shell would try to expand $foo and assign to whatever it expands to; typically not useful) Use the loop variable directly; it contains the array value rather than the … Read more
I agree with the answer currently proposed by fedorqui in the context of the question currently asked. The below is given only to provide some more general answers. One more general approach (for bash 4.0 or newer) is to store your pairs in an associative array: declare -A pairs=( [4_1]=4_2 [5_1]=5_2 [6_1]=6_2 [7_1]=7_2 [8_1]=8_2 ) … Read more
No, changing the type of loop wouldn’t matter. The only thing that can make it faster would be to have less nesting of loops, and looping over less values. The only difference between a for loop and a while loop is the syntax for defining them. There is no performance difference at all. int i … Read more
for /f “tokens=* delims= ” %%f in (myfile) do This reads a file line-by-line, removing leading spaces (thanks, jeb). set line=%%f sets then the line variable to the line just read and call :procesToken calls a subroutine that does something with the line :processToken is the start of the subroutine mentioned above. for /f “tokens=1* … Read more
You have some errors in your code: Use myArray[i].push( 0 ); to add a new column. Your code (myArray[i][j].push(0);) would work in a 3-dimensional array as it tries to add another element to an array at position [i][j]. You only expand (col-d)-many columns in all rows, even in those, which haven’t been initialized yet and … Read more
You’ve got some semicolons where you want commas: for (i=1, j=0, k=150; i<=5; i++, j+=30, k-=30) { /* do work */ } You should only have three “statements” inside your for for( [init]; [test]; [increments]) { [block] } To do multiple [inits] or [increments] you have to use the sometimes magical, but oft forgotten, comma … Read more