what is the easiest way to finding a match between values

Question

I am trying to find the matching value between two object values. I can iterate the array each time to get it.

But I am looking for some great simplest way ... any one help me?

here is what i look for :

let values = [
  {
    "handlingFee": "0.65",
    "min": "0",
    "max": "50000"
  },
  {
    "handlingFee": "0.60",
    "min": "50000",
    "max": "150000"
  },
  {
    "handlingFee": "0.55",
    "min": "150000",
    "max": "999999999"
  }
];

var findHandlingFee = function(){
    return values[0].handlingFee;
}

findHandlingFee(3000); //handlingFee": "0.65
findHandlingFee(5010); //handlingFee": "0.60"
findHandlingFee(300000); //"handlingFee": "0.55"

Answer 1

You can use find method which accepts as parameter a callback function.

 let values = [ { "handlingFee": "0.65", "min": "0", "max": "50000" }, { "handlingFee": "0.60", "min": "50000", "max": "150000" }, { "handlingFee": "0.55", "min": "150000", "max": "999999999" } ]; var findHandlingFee = function(value){ return values.find(function(item){ return item.min <= value && item.max >= value; }).handlingFee; } console.log(findHandlingFee(3000)); //handlingFee": "0.65 console.log(findHandlingFee(50010)); //handlingFee": "0.60" console.log(findHandlingFee(300000)); 

Answer 2

You can use array#filter method.It will return an array but can customize the return condition

 let values = [{ "handlingFee": "0.65", "min": "0", "max": "50000" }, { "handlingFee": "0.60", "min": "50000", "max": "150000" }, { "handlingFee": "0.55", "min": "150000", "max": "999999999" } ]; function findHandlingFee(val) { return values.filter(function(item) { // return that object where the val is between max and min value return +item.min <= val && +item.max >= val; }) } //[0] since filter return an array,getting only object in 0 index console.log(findHandlingFee(3000)[0].handlingFee);