loops - skipping 2 lines that comes back periodically when parsing javascript -


i'm trying parse document contains 500 times snippet of 258 lines:

256 (first line) atoms. timestep: 66000  1 0.702825 2.71217 2.71612  1 16.9592 2.64886 6.79019  1 0.681418 2.68359 10.8911  1 16.96 2.6822 14.9396  1 0.659922 6.77858 2.72442  1 16.9873 6.7709 6.77907  1 0.676686 6.76797 10.8581  ...   1 16.9295 6.74348 14.9315 (258th line)

so i'm trying ignore first 2 lines come periodically, have values want in array. here code it:

fetch('petit_film_256_atomes.txt').then(response => response.text()).then(text => {      var linestart = 0;     var lineend = 258;     (var j = linestart; j < lineend; j++) {         const positions = text.split('\n')             .map(line => line.trim())             .slice(2)             .map(line => line.split(' '))              .map(([size, x, y, z]) => ({                size: number(size),                x: number(x),                y: number(y),                z: number(z)              }));     }     linestart += 258;     lineend += 258; });

i thought using linestart , lineend variables first 2 lines every 258 lines can cut using slice(2), first 2 lines of whole document cut. how make slice repeat itself?

this should work.

const size = 258; let result = []; fetch('petit_film_256_atomes.txt')     .then(response => response.text())     .then((input) => {         // put every line array         const arr = input.split('\n')             .map(line => line.trim())          while (arr.length > 0)             result.push(                 arr                 .splice(0, size) // split array chunks of length 258                 .slice(2) // remove first 2 lines of every array                 .map(line => {                      const [size, x, y, z] = line.split(' ').map(number)                     return { size, x, y, z }                 })             );     })

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