dataset with subset of variables in javascript

To create a dataset with a subset of variables in JavaScript, you can use the filter and map functions.

Suppose you have a dataset data with several variables var1, var2, var3 and var4. If you want to create a new dataset with only var1 and var2, you can use the following code:

index.tsx
const newData = data.map(d => {
  return { 
    var1: d.var1,
    var2: d.var2
  };
});
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This code uses the map function to iterate over each object in the data array and return a new object with only the desired variables.

Alternatively, if you want to remove a specific variable from the dataset, you can use the filter function:

index.tsx
const newData = data.map(d => {
  const { var3, ...rest } = d;
  return rest;
});
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In this code, the destructuring assignment { var3, ...rest } is used to remove var3 from the object d. The remaining variables are then returned in the rest object. The filter function is not used explicitly, but the effect is the same: the unwanted variable is removed from the dataset.