Search Array of strings for matching character sequence-CodePudding

I have an array like this

const arr = ["Apple", "Banana", "Cherry", "Orange", "Avocado", "Ananas", "Pineapple];

I need a function that returns an array with all the Elements from arr, that match the given character sequence. The order of the characters is of importance.

Given "ppl" the function should return ["Apple", "Pineapple"].

Given "n" the function should return ["Banana", "Orange", "Ananas", "Pineapple"].

Given "voca" the function shoould return ["Avocado"]

Given "rr" the function should return ["Cherry"], while given a "r" the function should return ["Cherry", "Orange"].

CodePudding user response：

try this

const arr = ["Apple", "Banana", "Cherry", "Orange", "Avocado", "Ananas", "Pineapple"];


const search = query => arr.filter(s => s.toLowerCase().includes(query))

console.log(search("n"))
console.log(search("ppl"))

CodePudding user response：

It is also possible like this

const arr = ["Apple", "Banana", "Cherry", "Orange", "Avocado", "Ananas", "Pineapple"];

const query = 'pp';

arr.filter(element => element.includes(query));

CodePudding user response：

It's pretty straight forward using filter function and indexOf

const arr = ["Apple", "Banana", "Cherry", "Orange", "Avocado", "Ananas", "Pineapple"];
const cond = 'ppl'
console.log(arr.filter(x => x.indexOf(cond) > -1 ))

CodePudding user response：

<script>
function checkPattern(str, pattern) {
    var len = pattern.length;

    if (str.length < len) {
    return false;
    }

    for (var i = 0; i < len - 1; i  ) {
    var x = pattern[i];
    var y = pattern[i   1];

    var last = str.lastIndexOf(x);

    var first = str.indexOf(y);

    if (last === -1 || first === -1 || last > first) {
        return false;
    }
    }

    return true;
}

var str = "engineers rock";
var pattern = "gin";

document.write(checkPattern(str, pattern));
</script>

CodePudding user response：

You can use Array.prototype.filter() combined with String.prototype.includes():

const result = arr.filter(el => el.toLowerCase().includes(input.toLowerCase()))

Code:

const arr = ["Apple", "Banana", "Cherry", "Orange", "Avocado", "Ananas", "Pineapple"]
const inputs = ["ppl", "n", "voca", "rr", "r"]

inputs.forEach(input => {
  const result = arr.filter(el => el.toLowerCase().includes(input.toLowerCase()))
  console.log(`Result for ${input}:`, result)
})