whole_func_string: function ArrayFindIndex(predicate, thisArg) {
    CHECK_OBJECT_COERCIBLE(this, "Array.prototype.findIndex");
  
    var array = TO_OBJECT(this);
    var length = TO_INTEGER(array.length);
  
    return InnerArrayFindIndex(predicate, thisArg, array, length);
  }
func_code_string: function ArrayFindIndex(predicate, thisArg) {
    CHECK_OBJECT_COERCIBLE(this, "Array.prototype.findIndex");
  
    var array = TO_OBJECT(this);
    var length = TO_INTEGER(array.length);
  
    return InnerArrayFindIndex(predicate, thisArg, array, length);
  }
func_documentation_string: ES6 draft 07-15-13, section 15.4.3.24