Unable to execute a Less CSS loop properly -

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i'm trying create different loops (the class should have different background colours), i'm able compile first one.

here's example: http://codepen.io/anon/pen/mywgdo?editors=1100

and code i'm using:

@temp0-9: #1976d2; @temp10-20: #00bcd4; @gap1: 10; @gap2: 10;   .first (@i) when (@i > 0) {   span.temp-@{i} {     display:block;     background: @temp0-9;   }   .first(@i - 1); } .first(@gap1);  .second (@i) when (@i > 15) {   span.temp-@{i} {     display:block;     background: @temp10-20;   }   .second(@i - 1); } .second(@gap2);

the compiled result following:

 span.temp-9 {   display: block;   background: #1976d2; } span.temp-8 {   display: block;   background: #1976d2; } span.temp-7 {   display: block;   background: #1976d2; } span.temp-6{   display: block;   background: #1976d2; } span.temp-5{   display: block;   background: #1976d2; } span.temp-4{   display: block;   background: #1976d2; } span.temp-3{   display: block;   background: #1976d2; } span.temp-2{   display: block;   background: #1976d2; } span.temp-1{   display: block;   background: #1976d2; } span.temp-0{   display: block;   background: #1976d2; }

only 10 entries instead of 20 expecting.

any help?

you've got loop's guard conditions wrong. guard condition states loop executed when input (@i) greater 15 value passed input (@gap2) 10 , hence loop never gets executed.

for output expecting, change guard condition in below snippet. now, guard @i > 0 , loop executed selector interpolation in 2nd mixin uses @j variable (which @i + @gap1). since adding @gap1 loop's index, no. value appended selector greater 10 second loop.

@temp0-9: #1976d2; @temp10-20: #00bcd4; @gap1: 10; @gap2: 10;  .first (@i) when (@i > 0) {   span.temp-@{i} {     display:block;     background: @temp0-9;   }   .first(@i - 1); } .first(@gap1);  .second (@i) when (@i > 0) {   @j: @i + @gap1;   span.temp-@{j} {     display:block;     background: @temp10-20;   }   .second(@i - 1); } .second(@gap2);

demo @ less2css.org

if have multiple such gaps, writing single loop (with complex logic) better writing multiple loop mixins. below sample:

@gaps: 46, 19, 3, 4, 4, 14; /* gap array */ @temps: red, crimson, orange, gold, yellow, green; /* temps corresponding each gap */  .gaps-loop(@i, @prevgap) when (@i > 0){   @gap: extract(@gaps, @i); /* extract each gap 1 one based on loop index */   @temp: extract(@temps, @i); /* extract temp corresponding each gap */   .span-gen-loop(@j) when (@j < @gap){     /* loop generate spans - executed many times @gap */     @k: @j + @prevgap; /* add current index previous gaps - generates running number 0-90 */     span.temp-@{k}{       display:block;       background: @temp;     }     .span-gen-loop(@j + 1);   }   .span-gen-loop(0);   .gaps-loop(@i - 1, @prevgap + @gap); /* send current gap + previous gap(s) */ } .gaps-loop(length(@gaps), 0); /* loop many times there gaps */

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