Method remove

packages/formik/src/FieldArray.tsx:290–315

(index: number)

  handleUnshift = (value: any) => () => this.unshift(value);

  remove<T>(index: number): T {
    // We need to make sure we also remove relevant pieces of `touched` and `errors`
    let result: any;
    this.updateArrayField(
      // so this gets call 3 times
      (array?: any[]) => {
        const copy = array ? copyArrayLike(array) : [];
        if (!result) {
          result = copy[index];
        }
        if (isFunction(copy.splice)) {
          copy.splice(index, 1);
        }
        // if the array only includes undefined values we have to return an empty array
        return isFunction(copy.every)
          ? copy.every(v => v === undefined)
            ? []
            : copy
          : copy;
      },
      true,
      true
    );

    return result as T;
  }

  handleRemove = (index: number) => () => this.remove<any>(index);