Is it possible to assign a value to a variable based on a condition like this?
if (k<12){
var Case=4;
}
However, when I try to display this variable in the body of the page, it shows up as undefined.
document.write(Case);
Is it possible to assign a value to a variable based on a condition like this?
if (k<12){
var Case=4;
}
However, when I try to display this variable in the body of the page, it shows up as undefined.
document.write(Case);
Essentially, when you use the var keyword, it is hoisted and initially assigned the value of undefined.
Variable declarations in JavaScript are processed before any code execution takes place. A variable declared with
varhas a scope that is limited to its current execution context, which could be within a function or globally if declared outside any functions. If you re-declare a variable, its value will not be lost.
Here's the order of execution:
var Case; // hoisted, value: undefined
if (k < 12) {
Case = 4;
}
The reason you are receiving "undefined" is because the variable has not been properly defined. It is only assigned a value when the condition becomes true. To rectify this issue, ensure your code looks like the following:
var Case = null;
var k = 0;
if(k > 14) {
Case = 3;
}
document.write(Case);
I trust that this explanation was beneficial to you.
let switchCase = 0;
if(m<12){
switchCase = 8;
}
document.write(switchCase);
Make sure to initialize the variable first, so that it won't be undefined if the condition m<12 evaluates to false.
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