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for - loops through a block of code a number of times
for/in - loops through the properties of an object
for/of - loops through the values of an iterable object
while - loops through a block of code while a specified condition is true
do/while - also loops through a block of code while a specified condition is true
for (let i = 0; i < cars.length; i++) {
text += cars[i] + "<br>";
}
For Loop
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for (expression 1; expression 2; expression 3) {
// code block to be executed
}
Example of For Loop
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for(let i = 0; i < arr.length; i++){
// code block to be executed
}
For In Loop
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for (key in object) {
// code block to be executed
}
Example of For In Loop
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for (let x in arr) {
// code block to be executed
}
For Of Loop
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for (variable of iterable) {
// code block to be executed
}
Example of For Of Loop
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for (let x of arr) {
// code block to be executed
}
While Loop
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while (condition) {
// code block to be executed
}
Example of While Loop
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while (i < 10) {
// code block to be executed
i++;
}
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// Arrow function
forEach((element) => { } )
forEach((element, index) => { } )
forEach((element, index, array) => { } )
// Callback function
forEach(callbackFn)
forEach(callbackFn, thisArg)
// Inline callback function
forEach(function callbackFn(element) { })
forEach(function callbackFn(element, index) { })
forEach(function callbackFn(element, index, array){ })
forEach(function callbackFn(element, index, array) { }, thisArg)
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//this is javascript
var speed = 100;
setInterval(function() {
//DO SOMETHING THAT REPEATS
},speed);
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for (var i = 0; i < cats.length; i++) {
if (i === cats.length - 1) {
info += 'and ' + cats[i] + '.';
} else {
info += cats[i] + ', ';
}
}
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<body>
<h2>Automatic Slideshow</h2>
<p>Change image every 5 seconds:</p>
<div class="slideshow-container">
<div class="mySlides fade">
<img src="img_nature_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="img_snow_wide.jpg" style="width:100%">
</div>
<div class="mySlides fade">
<img src="img_mountains_wide.jpg" style="width:100%">
</div>
</div>
<br>
<div class="row">
<div class="column">
<img id="myBtn" class="demo cursor stop_loop" src="img_woods.jpg" style="width:100%" onclick="currentSlide(0); breakLoop();">
</div>
<div class="column">
<img id="myBtn" class="demo cursor stop_loop" src="img_5terre.jpg" style="width:100%" onclick="currentSlide(1)">
</div>
<div class="column">
<img id="myBtn" class="demo cursor stop_loop" src="img_mountains.jpg" style="width:100%" onclick="currentSlide(2)">
</div>
</div>
<script>
var slideIndex = 0; //indica che parto dall'immagine n.1
showSlides();
// script per lo slide delle immagini al click
function plusSlides(n) {
showSlides(slideIndex += n);
}
function currentSlide(n) {
showSlides(slideIndex = n);
}
// funzione per mostrare le slides
function showSlides() {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("demo");
var exitLoop = 0; //interrompere il loop al click delle immagini
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
slideIndex++;
if (slideIndex > slides.length) {slideIndex = 1}
for (i = 0; i < dots.length; i++) {
dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
enter code here
if(exitLoop == 0) {
setTimeout(showSlides, 5000); // Change image every 5 seconds
}
}
</script>
</body>
</html>
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var frutas = ['Maçã', 'Banana'];
console.log(frutas.length);
// 2