this.arr = userData; // -> json
this.pId = this.arr.pId; // value is 1 or 2 or 3

pVal: Array<Object> = [{id:1, group:'VKC'},
{id:2, group:'ABC'},
{id:10, group:'DEF'},
{id:3, group:'GHI'},
{id:5, group:'JKL'},]

alert(this.pVal['1'].group);
this.pInd = this.pVal[this.pId].group;