JS Random range visualizer

index.js

/* RANGE VISUALIZER BY VITYASCHEL
   This script is useful when you want to check equality of random results.
   Run testingRandom with function and limit of checks
   More checks = more accurate
   Example: testingRandom(() => Math.random().toFixed(1), 10000)
   Output:
    0.0 *********
    0.1 *******************
    0.2 *******************
    0.3 ******************
    0.4 ********************
    0.5 *******************
    0.6 *******************
    0.7 ******************
    0.8 *******************
    0.9 *******************
    1.0 *********
*/

function testingRandom(func, limitChecks = 10000) {
    let objSrc = {}
    for (let i = 0; i < limitChecks; i++){
        let res = func()
        let count = objSrc[res]
        if(count === undefined)
            count = 0
        objSrc[res] = count+1
    }
    let ordered = Object.keys(objSrc).sort().reduce(
      (obj, key) => { 
        obj[key] = objSrc[key]; 
        return obj
      }, 
      {}
    )
    let visual = ""
    let maxOfValues = Math.max(...Object.values(ordered))
    let stringOfSymbols = '********************'
    let maxSymbols = stringOfSymbols.length
    for(let [k, v] of Object.entries(ordered)) {
        let timesOfSymbol = (v*maxSymbols)/maxOfValues
        visual+=k+' '+stringOfSymbols.substring(0,timesOfSymbol)+' ('+(v/limitChecks*100)+'%)\n'
    }
    console.log(visual)
    return ordered
}