I would like to get find elements having same characters but in different order in an array. I made javascript below,is there any way to create Javascript function more basic? Can you give me an idea? Thank you in advance..
<p id="demo"></p>
<script>
const arr1 = ["tap", "pat", "apt", "cih", "hac", "ach"];
var sameChars = 0;
var subArr1 = [];
for(var i = 0; i < arr1.length; i++){
for(var j = i+1; j < arr1.length; j++){
if(!subArr1.includes(arr1[i]) && !subArr1.includes(sortAlphabets(arr1[i]))){
subArr1.push(arr1[i]);
sameChars++;
}
if(sortAlphabets(arr1[i]) == sortAlphabets(arr1[j])){
if(!subArr1.includes(arr1[j])){
subArr1.push(arr1[j]);
}
}
}
}
function sortAlphabets(text1) {
return text1.split('').sort().join('');
};
document.getElementById("demo").innerHTML = sameChars;
</script>I would just use reduce. Loop over split the string, sort it, join it back. Use it as a key in an object with an array and push the items onto it.
const arr1 = ["tap", "pat", "apt", "cih", "hac", "ach"];
const results = arr1.reduce((obj, str) => {
const key = str.split('').sort().join('');
obj[key] = obj[key] || [];
obj[key].push(str);
return obj;
}, {});
console.log(Object.values(results));You can get the max frequency value by building a map and getting the max value of the values.
const frequencyMap = (data, keyFn) =>
data.reduce(
(acc, val) =>
(key => acc.set(key, (acc.get(key) ?? 0) + 1))
(keyFn(val)),
new Map());
const groupMap = (data, keyFn) =>
data.reduce(
(acc, val) =>
(key => acc.set(key, [...(acc.get(key) ?? []), val]))
(keyFn(val)),
new Map());
const
data = ["tap", "pat", "apt", "cih", "hac", "ach"],
sorted = (text) => text.split('').sort().join(''),
freq = frequencyMap(data, sorted),
max = Math.max(...freq.values()),
groups = groupMap(data, sorted);
document.getElementById('demo').textContent = max;
console.log(Object.fromEntries(freq.entries()));
console.log(Object.fromEntries(groups.entries()));.as-console-wrapper { top: 2em; max-height: 100% !important; }<div id="demo"></div>Maybe split the code into two functions - one to do the sorting and return a new array, and another to take that array and return an object with totals.
const arr = ['tap', 'pat', 'apt', 'cih', 'hac', 'ach'];
// `sorter` takes an array of strings
// splits each string into an array, sorts it
// and then returns the joined string
function sorter(arr) {
return arr.map(str => {
return [...str].sort().join('');
});
}
// `checker` declares an object and
// loops over the array that `sorter` returned
// creating keys from the strings if they don't already
// exist on the object, and then incrementing their value
function checker(arr) {
const obj = {};
for (const str of arr) {
// All this line says is if the key
// already exists, keep it, and add 1 to the value
// otherwise initialise it with 0, and then add 1
obj[str] = (obj[str] || 0) + 1;
}
return obj;
}
// Call `checker` with the array from `sorter`
console.log(checker(sorter(arr)));<p id="demo"></p>Additional documentation