JavaScript spread Operator
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JavaScript spread Operator
The spread operator allows an iterable to expand in places where zero or more arguments are expected. It is mostly used in variable array where there is more than one values are expected.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var arr = [1, 2, 3, 4];
function myFunction(w, x, y, z){
return w + x + y + z;
}
document.write(myFunction(...arr));
</script>
</body>
</html>
Syntax
...iterableObj
More Examples
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var dateFields = [2020, 10, 13]; // 13 Nov 2020
var d = new Date(...dateFields);
document.write(d);
</script>
</body>
</html>
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var arr1 = ["two", "three"];
var arr2 = ["one", ...arr1, "four", "five"];
var txt = "";
for(var i = 0; i < arr2.length; i++)
txt += arr2[i] + "<br>";
document.write(txt);
</script>
</body>
</html>
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Check your console (Press F12).<p>
<script>
var obj1 = { foo: 'ABC', x: 53 };
var obj2 = { foo: 'XYZ', y: 75 };
var clonedObj = { ...obj1 };
console.log(clonedObj);
</script>
</body>
</html>
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<p>Check your console (Press F12).<p>
<script>
var obj1 = { foo: 'ABC', x: 53 };
var obj2 = { foo: 'XYZ', y: 75 };
var mergedObj = { ...obj1, ...obj2 };
console.log(mergedObj);
</script>
</body>
</html>
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