Order of Execution in a For Loop

The For Loop is not only the most important and widely used loop in all modern computer languages, but perhaps the most cleverly invented. The only thing that’s a little confusing for the novice programmer is that the order of execution is not as you see.

Here’s the typical syntax for a few C-based derivative languages:

Java

for(int i=0; i<10; i++){ }

JavaScript/TypeScript

for(let i=0; i<10; i++){ }

PHP

for($i = 0; $i<10; $i++){ }

The steps in order of execution in a FOR LOOP are:

for ( step 1; step 2; step 4) { step 3 }

Here’s my video proving it:

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