如何防止 forEach 循环内的 function 被多次调用？ （在大多数情况下，它会重复出现）

Question

I have a function included in a forEach loop that repeats unpredictably

function setColorColumns(id) {
  getID = id.replace("#", "");
  color_ranges.forEach((item) => {
  colorRangeDivs += `<div class="col ${item.colorGroup.toLowerCase()}" title="${item.colorGroup}" style="background:${item.colorGroup.toLowerCase()}">`;
  colorRangeDivs += `<label for="chk_${getID}_${item.colorGroup.toLowerCase()}">`;
  colorRangeDivs += `<input type="checkbox" id="chk_${getID}_${item.colorGroup.toLowerCase()}"></label></div>\n`;
  });
  return colorRangeDivs;
}

namedColors.forEach((item) => {
  colorDiv = setColorColumns(item.hex);
  colorTable1 = `<div class="color_table_row"><div class="col2"     style="background:${item.hex}">`;
  colorTable2 = `${item.color} (${item.hex})</div>`;
  colorTable3 = `</div>`;
  colorTable += `${colorTable1}${colorTable2}${colorDiv}${colorTable3}`;
});  

The setColorColumns() function creates the checkboxes and that's what repeats for every iteration. If anything, I would think the entire row would repeat, but obviously I'm missing something...

Here's a CodePen version: https://codepen.io/NoahBoddy/pen/WNpzMbV

Answer 1

You can use index inside the foreach loop to solve this issue.

// FOREACH
namedColors.forEach((item, index) => {
  if(index === 0) {
    colorDiv = setColorColumns(item.hex);
  }
  colorTable1 = `<div class="color_table_row"><div class="col2" style="background:${item.hex}">`;
  colorTable2 = `${item.color} (${item.hex})</div>`;
  // this is the line that's getting me in trouble
  colorTable3 = `</div>`;
  colorTable += `${colorTable1}${colorTable2}${colorDiv}${colorTable3}`;
  
});