Javascript For Loops

Rishabh

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In this tutorial we'll start with introduction to Loops and then cover For Loops in JS.

Loops allow you to execute a piece of code repeatedly as long as the specified condition holds true!

Remember, if the specified condition never evaluates to false then it'll lead to an infinite loop that'll never end causing your browser (or server) to slow down and maybe even crash.

An example of infinite for loop:

for (var i = 0; i < 10;);

The loop has no statement inside. Since there's no incrementExpression , i will always be 0, and the condition i < 10 will always evaluate to true causing the loop to execute endlessly.

Notes:

• In the codecast, this piece of code is used - Array(j).join('*'). It basically repeats a piece of string j-1 times. So if j is 6, then the expression will return '*****' (5 times).

Related:

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