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How to Iterate Through Array Keys in JavaScript?

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To iterate through array keys in JavaScript, we can use the JavaScript array keys method to get the keys.

For instance, we can write:

const widthRange = []
widthRange[46] = {
  min: 0,
  max: 52
};
widthRange[66] = {
  min: 52,
  max: 70
};
widthRange[90] = {
  min: 70,
  max: 94
};

for (const i of widthRange.keys()) {
  if (widthRange[i]) {
    console.log(i)
  }
}

to loop through the keys of the widthRange array with the for-of loop.

We call the keys method to remove all the indexes of the array.

And in the loop body, we check if the item widthRange[i] is truthy before logging its value.

Therefore. we get 46, 66, and 90 from the console log.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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