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Version: v4.23

has

Checks whether a record has a specified field.

has(x:string) -> bool

Description​

The has function returns true if the record contains the specified field x and false otherwise.

Examples​

Check if a record has a specific field​

from {
  x: "foo",
  y: null,
}
this = {
  has_x: this.has("x"),
  has_y: this.has("y"),
  has_z: this.has("z"),
}
{
  has_x: true,
  has_y: true,
  has_z: false,
}