Search in a text string with 'in'

May 18, 2020 • edited May 19, 2020

After JavaScript (EcmaScript), Python is my second favorite programming language. It has a very low learning curve, making it quite intuitive compared to other languages ​​and its list of basic keywords is short. Any individual can quickly adapt, even those who have never written a line of code (but who understand English).

One of the basic Python keywords is in, used to search for portions of text within a text string, list, dictionary or tuple.

if 'banana' in ('apple','pineapple','banana','pear'):  
    print 'Banana is a fruit'  
    print 'Nop, is an animal'  

if 'banana' in 'Tonight we will eat banana dessert':  
    print 'Cool, is banana tonight!'  
    print "I'm not hungry"  

JavaScript also has its inbut it is contingent on being an operator , usually tied to the loop forby its limited way of reacting.

var fruits = ['apple','pineapple','banana','pear'];

for (var f in fruits)
    var fruit = fruits[f];

How about we emulate inin JavaScript to evaluate a portion of text? Many times I have had to look for portions of text in a large string, so going over the matter here I show you a function that I prepared to which we can pass an array, a text string or a JavaScript object. = function(arr)
    var str = String(this);
    var arr = arr || [];

    function accents (s)
        s = String(s).toLowerCase().trim();

        s = s.replace(/á|à|â|ã|ä|å|ā|æ/gi,'a');
        s = s.replace(/é|è|ê|ë|ē|ę/gi,'e');
        s = s.replace(/í|î|ï|ī/gi,'i');
        s = s.replace(/õ|ó|ô|ö|ő|ō|ø|œ/gi,'o');
        s = s.replace(/ú|ü|û|ů|ű|ŭ|ū/gi,'u');

        s = s.replace(/ç|č|ĉ|ć/gi,'c');
        s = s.replace(/š|ŝ|ś|ş/gi,'s');
        s = s.replace(/ÿ|ý|ŷ/gi,'y');
        s = s.replace(/ž|ź|ż/gi,'z');
        s = s.replace(/ţ|ț/gi,'t');
        s = s.replace(/ñ|ň/gi,'n');
        s = s.replace(/ř/gi,'r');
        s = s.replace(/ĵ/gi,'j');
        s = s.replace(/ğ/gi,'g');
        s = s.replace(/ŵ/gi,'w');
        s = s.replace(/[^0-9a-z]/gi,'');

        return s;

    str = accents(str);

    if ( typeof arr === 'object' )
        arr = accents(JSON.stringify(arr));

    if ( typeof arr === 'string' )
        arr = accents(arr);

    return arr.indexOf(str) > -1;

We apply it like this:

var fruits = ['apple','pineapple','banana','pear'];
// var fruits = [{ fruit: 'apple' }, { fruit: 'pineapple' }, { fruit: 'banana' }, { fruit: 'pear' }];
// var fruits = 'apple, pineapple, banana, pear';
var banana = 'banana';

if ( )
    console.log('Banana is a fruit');
} else {
    console.log('Nop, is an animal');

If the word ‘banana’ is inside an array, a text string, or a JavaScript object, it will return true, otherwise false.

This will simplify our work a bit, don’t you think?



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