What is the rationale behind requiring a semicolon specifically for IE11 in this function?

Question

What is the rationale behind requiring a semicolon specifically for IE11 in this function?

Currently, I am tackling some vuejs code to ensure compatibility with IE 11. Struggling with a persistent expected semicolon error in this particular function:

chemicalFilters: function (chemical) 
{            
  var max = 0;
  var min = 100;
  for (var component of this.components)
  {
     if(component.component_name == chemical)
     {
       if (max < component.component_value)
         max = component.component_value;
       if(component.component_value != 0 && min > component.component_value)
         min = component.component_value;
     }
  }

  if(max == 0 && min == 100)
    min = max;
  else
  {
    min = Math.round(min*100);
    max = Math.round(max*100);
  }

  this.component_filters.push({component_name: chemical, range:[min,max], min:min, max:max, originalRange:[min,max]});
},

Especially concerned about this line:

if(component.component_name == chemical)

javascript internet-explorer vue.js

Answer 1

Answer №1

The issue doesn't lie in the mentioned line, but rather in the line above it. The use of the for...of loop was introduced in ECMAScript 2015, which is not fully compatible with IE11. For more information, refer to MDN:

https://i.sstatic.net/3bPnh.png

You can utilize a tool like Babel to transpile this code into backward-compatible code. For example:

for (var component of this.components) {
  //...
}

This would be transpiled to something similar to the following (based on your preferences):

var _iteratorNormalCompletion = true;
var _didIteratorError = false;
var _iteratorError = undefined;

try {
  for (var _iterator = this.components[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
    //...

    var component = _step.value;
  }
} catch (err) {
  _didIteratorError = true;
  _iteratorError = err;
} finally {
  try {
    if (!_iteratorNormalCompletion && _iterator.return != null) {
      _iterator.return();
    }
  } finally {
    if (_didIteratorError) {
      throw _iteratorError;
    }
  }
}

Answer 2

The issue doesn't lie in the mentioned line, but rather in the line above it. The use of the for...of loop was introduced in ECMAScript 2015, which is not fully compatible with IE11. For more information, refer to MDN:

https://i.sstatic.net/3bPnh.png

You can utilize a tool like Babel to transpile this code into backward-compatible code. For example:

for (var component of this.components) {
  //...
}

This would be transpiled to something similar to the following (based on your preferences):

var _iteratorNormalCompletion = true;
var _didIteratorError = false;
var _iteratorError = undefined;

try {
  for (var _iterator = this.components[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
    //...

    var component = _step.value;
  }
} catch (err) {
  _didIteratorError = true;
  _iteratorError = err;
} finally {
  try {
    if (!_iteratorNormalCompletion && _iterator.return != null) {
      _iterator.return();
    }
  } finally {
    if (_didIteratorError) {
      throw _iteratorError;
    }
  }
}

What is the rationale behind requiring a semicolon specifically for IE11 in this function?

Answer №1

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