JavaScript Logical AND assignment (&&=) Operator
Last Updated :
06 Jan, 2023
This operator is represented by x &&= y, and it is called the logical AND assignment operator. It assigns the value of y into x only if x is a truthy value.
We use this operator x &&= y like this. Now break this expression into two parts, x && (x = y). If the value of x is true, then the statement (x = y) executes, and the value of y gets stored into x but if the value of x is a falsy value then the statement (x = y) does not get executed.
Syntax :
x &&= y
is equivalent to
x && (x = y)
Example: This example shows the basic use of the Javascript Logical AND assignment(&&=) operator.
Javascript
<script>
let name = {
firstName: "Ram" ,
lastName: "" ,
};
console.log(name.firstName);
name.firstName &&= "Shyam" ;
console.log(name.firstName);
console.log(name.lastName);
name.lastName &&= "Kumar" ;
console.log(name.lastName);
</script>
|
Output :
"Ram"
"Shyam"
""
""
Example 2: This example shows the basic use of the Javascript Logical AND assignment(&&=) operator.
HTML
< h1 style = "color:green" >
Geeksforgeeks
</ h1 >
< h3 >
Javascript Logical AND assignment(&&=) operator
</ h3 >
< p id = "print_arr" ></ p >
< script >
let arr = [1, 2, "apple", null, undefined, []]
// Replace each truthy values with "gfg"
arr.forEach((item, index)=>{
arr[index] &&= "gfg"
})
document.getElementById("print_arr").innerText = arr.toString();
//console.log(arr)
</ script >
|
Output :
Javascript Logical AND assignment(&&=) operator
We have a complete list of Javascript Operators, to check those please go through the Javascript Operators Complete Reference article.
Supported Browsers:
- Chrome 85
- Edge 85
- Firefox 79
- Safari 14
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