ngrx-forms/esm2015/src/array/reducer/add-control.js

Proper integration of forms in Angular 4 applications using ngrx

import { AddArrayControlAction } from '../../actions';
import { computeArrayState, createChildState } from '../../state';
import { childReducer, updateIdRecursive } from './util';
export function addControlReducer(state, action) {
    if (action.type !== AddArrayControlAction.TYPE) {
        return state;
    }
    if (action.controlId !== state.id) {
        return childReducer(state, action);
    }
    const index = action.index === undefined ? state.controls.length : action.index;
    if (index > state.controls.length || index < 0) {
        throw new Error(`Index ${index} is out of bounds for array '${state.id}' with length ${state.controls.length}!`);
    }
    let controls = [...state.controls];
    controls.splice(index, 0, createChildState(`${state.id}.${index}`, action.value));
    controls = controls.map((c, i) => updateIdRecursive(c, `${state.id}.${i}`));
    return computeArrayState(state.id, controls, state.value, state.errors, state.pendingValidations, state.userDefinedProperties, {
        wasOrShouldBeDirty: true,
        wasOrShouldBeEnabled: state.isEnabled,
        wasOrShouldBeTouched: state.isTouched,
        wasOrShouldBeSubmitted: state.isSubmitted,
    });
}
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