How JavaScript Reads Your Instructions
When you write a JavaScript program, the computer reads your instructions from top to bottom, one line at a time. This is called sequential execution. Each statement runs in the order you wrote it, unless you use special instructions to change that order. These special instructions are called control flow statements, and they include things like conditionals and loops.
Conditionals, such as if statements, tell the computer to make decisions and possibly skip some lines of code.
Loops, like for and while, allow the computer to repeat certain instructions multiple times.
By using these tools, you can make your programs smarter and more flexible, changing the path your code takes based on different situations.
1234567891011console.log("Start"); console.log("Step 1"); console.log("Step 2"); let doExtraStep = true; if (doExtraStep) { console.log("Extra Step"); } console.log("Finish");
In this example, JavaScript reads and runs each console.log in order. But when it reaches the if statement, it checks the condition. If doExtraStep is true, it runs the code inside the braces and prints "Extra Step". If doExtraStep were false, that line would be skipped.
This shows how you can change the flow of your program by using conditionals.
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Can you explain how loops work in JavaScript?
What happens if I set `doExtraStep` to false?
Can you give more examples of control flow statements?
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When you write a JavaScript program, the computer reads your instructions from top to bottom, one line at a time. This is called sequential execution. Each statement runs in the order you wrote it, unless you use special instructions to change that order. These special instructions are called control flow statements, and they include things like conditionals and loops.
Conditionals, such as if statements, tell the computer to make decisions and possibly skip some lines of code.
Loops, like for and while, allow the computer to repeat certain instructions multiple times.
By using these tools, you can make your programs smarter and more flexible, changing the path your code takes based on different situations.
1234567891011console.log("Start"); console.log("Step 1"); console.log("Step 2"); let doExtraStep = true; if (doExtraStep) { console.log("Extra Step"); } console.log("Finish");
In this example, JavaScript reads and runs each console.log in order. But when it reaches the if statement, it checks the condition. If doExtraStep is true, it runs the code inside the braces and prints "Extra Step". If doExtraStep were false, that line would be skipped.
This shows how you can change the flow of your program by using conditionals.
Merci pour vos commentaires !
