Is it possible to combine multiple filter examples together?

Question

Is it possible to combine multiple filter examples together?

Could you please provide some examples or references related to the next task:

var planets = [{
        residents: [{
                name: 'Mars'
            },
            {
                name: 'Jupiter'
            },
            {
                name: 'Saturn'
            }
        ]
    },
    {
        residents: [{
                name: 'Mars'
            },
            {
                name: 'Saturn'
            }
        ]
    }
]

In

<input type='text'>

If I type "Mars and Jupiter" - I expect to get planets[0] object

If I type "Mars and not Jupiter" - I aim to retrieve planets[1] object

The QUERY is how do you analyze the text and determine where the keywords AND and NOT are located? I hope my explanation was sufficient. Thank you in advance and have a wonderful day!

javascript angularjs

Answer 1

Answer №1

Presented here is a custom function designed to extract names and exclude certain terms from an array. Users have the ability to customize their own filtering criteria.

function findNamesAndExclusions(text) {
    var names = [],
        exclusions = [];
    text = text.replace(/\s\s+/g, ' '); // eliminate extra spaces
    var words = text.split(' ');
    for (var i = 0; i < words.length; i++) {
        var word = words[i].toLowerCase();
        if (i == 0)
            names.push(words[i]);
        else if (word != 'and' && word != 'not') {
            if (words[i - 1].toLowerCase() != 'not')
                names.push(words[i]);
            else
                exclusions.push(words[i]);
        }
    }
}

Answer 2

Presented here is a custom function designed to extract names and exclude certain terms from an array. Users have the ability to customize their own filtering criteria.

function findNamesAndExclusions(text) {
    var names = [],
        exclusions = [];
    text = text.replace(/\s\s+/g, ' '); // eliminate extra spaces
    var words = text.split(' ');
    for (var i = 0; i < words.length; i++) {
        var word = words[i].toLowerCase();
        if (i == 0)
            names.push(words[i]);
        else if (word != 'and' && word != 'not') {
            if (words[i - 1].toLowerCase() != 'not')
                names.push(words[i]);
            else
                exclusions.push(words[i]);
        }
    }
}

Answer 3

Answer №2

When it comes to parsing text and executing code based on it, things can get complex. The key is to simplify the rules of the system as much as possible.

One challenge that arises is distinguishing a name from common keywords like and or not. One approach could be maintaining a list such as const keywords = ['and', 'not'] and treating anything outside this list as a name. But what about case sensitivity? Should we consider capitalization, for example, treat And as a name because it's capitalized? Capitalization might serve as a simple way to differentiate names from non-names.

These are just a few aspects to consider among many others.

For the sake of simplicity, let's assume the problem at hand is straightforward. We only aim to achieve the minimum goal. For instance, assuming all names should be included except those preceded by the keyword not.

// This implementation is overly simplistic and unsuitable for production. It may fail with basic issues like whitespace.
const isName = (str) => {
    return str[0] === str[0].toUpperCase();
};

const input = document.querySelector('input[type="text"]');
input.addEventListener('change', (evt) => {
    const tokens = evt.target.value.split(' ');
    const names = tokens.filter((name, i, arr) => {
        return isName(name) && arr[i - 1] !== 'not';
    });
    const company = {
        members : names.map((name) => {
            return { name };
        })
    };
});

Answer 4

When it comes to parsing text and executing code based on it, things can get complex. The key is to simplify the rules of the system as much as possible.

One challenge that arises is distinguishing a name from common keywords like and or not. One approach could be maintaining a list such as const keywords = ['and', 'not'] and treating anything outside this list as a name. But what about case sensitivity? Should we consider capitalization, for example, treat And as a name because it's capitalized? Capitalization might serve as a simple way to differentiate names from non-names.

These are just a few aspects to consider among many others.

For the sake of simplicity, let's assume the problem at hand is straightforward. We only aim to achieve the minimum goal. For instance, assuming all names should be included except those preceded by the keyword not.

// This implementation is overly simplistic and unsuitable for production. It may fail with basic issues like whitespace.
const isName = (str) => {
    return str[0] === str[0].toUpperCase();
};

const input = document.querySelector('input[type="text"]');
input.addEventListener('change', (evt) => {
    const tokens = evt.target.value.split(' ');
    const names = tokens.filter((name, i, arr) => {
        return isName(name) && arr[i - 1] !== 'not';
    });
    const company = {
        members : names.map((name) => {
            return { name };
        })
    };
});

Is it possible to combine multiple filter examples together?

Answer №1

Answer №2

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