My Blog

Here you can find my private notes about programming that I wanted to share with you. Feel free to filter based on the topic you want or search for something specific.

    Immutable Strings And Mutable Arrays

    Strings in JavaScript are immutable which means that once a string is defined, it cannot be changed anymore. Trying to change a string with a standard String-function will only create a new string and not affect the original string. Consider the following example, where the value in string1 is not changed:

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    var string1 = "LOREM IPSUM";
string1.toLowerCase();
console.log(string1);
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    Data types in JavaScript

    Inspired from an exercise in Hackerrank.com, I found the opportunity to present you the data types that JavaScript defines, which are the following six:

    Arrays and functions are plain objects in JavaScript and they both belong to the object data type.

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    Using a variable as a regular expression to find all matches inside a string

    Often I have to use a value from a variable and not a fixed string inside a regular expression. For example if I wanted to iterate over the english alphabet and find the number of occurrences of each letter inside a string, I had to do something like the following:

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    var testString = "Lorem ipsum dolor sit amet, consetetur sadipscing elitr.";
var matches = testString.match(/a/g).length;
// do this for all the remaining letters

    the previous example would work and would find all occurrences of “a”.

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