Function pureFunction4Internal

packages/core/src/render3/pure_function.ts:435–454

(
  lView: LView,
  bindingRoot: number,
  slotOffset: number,
  pureFn: (v1: any, v2: any, v3: any, v4: any) => any,
  exp1: any,
  exp2: any,
  exp3: any,
  exp4: any,
  thisArg?: any,
)

 *
 */
export function pureFunction4Internal(
  lView: LView,
  bindingRoot: number,
  slotOffset: number,
  pureFn: (v1: any, v2: any, v3: any, v4: any) => any,
  exp1: any,
  exp2: any,
  exp3: any,
  exp4: any,
  thisArg?: any,
): any {
  const bindingIndex = bindingRoot + slotOffset;
  return bindingUpdated4(lView, bindingIndex, exp1, exp2, exp3, exp4)
    ? updateBinding(
        lView,
        bindingIndex + 4,
        thisArg ? pureFn.call(thisArg, exp1, exp2, exp3, exp4) : pureFn(exp1, exp2, exp3, exp4),
      )
    : getPureFunctionReturnValue(lView, bindingIndex + 4);
}

/**
 * pureFunction instruction that can support any number of bindings.