JSFiddle - React, Tailwind, and code Playground

HTML

<div id="demo"></div>

JavaScript

var values = [
    {
       "name": "a",
       "value": 5
},
    {"name":"b",
      "value":10
    },
    {
        "name":"c",
        "value":4
    }
];

function min(arr){
    var minValue = {};
    for(var x = 0; x < arr.length; x++){
        if(arr[x].value < minValue.value || !minValue.value){
            minValue = arr[x];
        }
    }
    return minValue.name;
};

document.getElementById("demo").innerHTML = min(values);