JavaScript charAt() method

Part of JavaScript's String object, the charAt() method treats text like arrays: it takes an integer argument, and returns the character it found at that position index. Let's find the first character: var str = "I learn JavaScript"; // The index starts at zero: alert( str.charAt(0) ); // returns "I"
Tip: remember that charAt(1) returns the *second* character, because indices start at 0.
Using the String.length property, you can quickly check what a string's last character is. Because the index starts at zero, the last character's index is always the number of characters minus one: var str = "I learn JavaScript"; alert( str.charAt( str.length-1 ) ); // returns "t" If you pass an index greater than the length of the string, JavaScript will return an empty string.
The PHP equivalent to JavaScript's charAt() is simply to add curly braces and a zero-based character index after the string (there are other techniques, but this one is the simplest!) $str = 'I learn PHP'; echo $str{3}; // returns 'e'
Sister method: charCodeAt() returns the Unicode value for the character found at that index. From 0 to 128 (mostly Latin alphabet), these codes correspond to ASCII encoding. And fromCharCode() takes Unicode codes as arguments, and returns the corresponding string.

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