Checks if array is similar or not

isArraySimilar.js

mapArray = (array) => {
    const mapObj = {}
    if(array.length === 0) {
        return mapObj
    }
    for(let i=0; i<array.length; ++i) {
        const value = array[i]
        if(mapObj[value]) {
            ++mapObj[value]
        }else{
            mapObj[value] = 1
        }
    }
    return mapObj
}

isObjectSimilar = (obj1, obj2) => {
    const keysObj1 = Object.keys(obj1)
    const keysObj2 = Object.keys(obj2)

    if(keysObj1.length != keysObj2.length) {
        return 0
    }
    for(let i=0;i<keysObj1.length;++i) {
        const key = keysObj1[i]
        if(obj1[key] != obj2[key]) {
            return 0
        } 
    }
    return 1
}

isArraySimilar = (arr1, arr2) => {
    if(arr1.length != arr2.length) {
      return 0
    }
    const arr1Map = mapArray(arr1)
    const arr2Map = mapArray(arr2)
    return isObjectSimilar(arr1Map, arr2Map)
}

console.log(isArraySimilar([1, 2, 3], [1, 2, 3]))
console.log(isArraySimilar([1, 2, 3], [2, 1, 3])); //true
console.log(isArraySimilar([1, 2, 2], [2, 1, 1])); //false