findPhrase.js

// function for validating parameter 
const validateParam = (param2validate) => {
    if (!param2validate) return false;
    if (param2validate.length === 0) return false;
    if (typeof param2validate != 'string') return false;
};


const searchPhrase = (phrase, data) => {
    if (validateParam(phrase) === false){
        return console.error('Error Occured');
    }
    if (validateParam(data) === false){
        return console.error('Error Occured');
    }

    let dataChunk = data.split('');
    let firstCharInPhrase = phrase.split('')[0];    //to get the first Character of the phrase to be searched
    let charPosInString = null;      // to store the char which are matching and found in data  
    let arrCharIndex = [];          // to store matching character position
    for (let i=0; i<dataChunk.length; i++) {
        if (firstCharInPhrase === dataChunk[i]) {
            charPosInString = dataChunk[i];
            arrCharIndex.push(i);       // will be pushed to arrCharIndex for further ref
        } else if (charPosInString === null && i === dataChunk.length - 1) return console.log(false);
    }
    // loop to get char pos and increase it's length number according to dataPhrase
    let dataLengthCounter = [];     // to store dataLength. Ex, for pos 8 and data.length 3; it will be dataLengthCounter[0] = [8, 9, 10]
    for (let i=0; i<phrase.length; i++) {
        dataLengthCounter[i] = [];    // defining new array  
    }

    // Loop to push arrCharIndex to dataLengthCounter
    for(let i=0; i<phrase.length; i++) {    
        for (let j=0; j<phrase.length; j++) {
            dataLengthCounter[i].push(arrCharIndex[i]);
            arrCharIndex[i]++;
        }
    }
    let word = [];
    let wordArr = [];
    for (let i=0; i<dataLengthCounter.length; i++) {
        wordArr[i] = [];
    }
    for (let a in dataLengthCounter) {
        for (let i=0; i<phrase.length; i++) {
            for (let j in dataChunk) {
                if (dataLengthCounter[a][i] === +j) {
                    wordArr[a].push(dataChunk[j]);
                }
            }
        }
    }
    for (let i in wordArr) {
        word[i] = wordArr[i].join('');
    }
    for (let i in word) {
        if (phrase === word[i]) {
            return console.log(true);
        } else {
            return console.log(false);
        }
    }
};