[Solved] Does || operator disable further concatenation? [closed]

by


+ has higher precedence than ||. What this means is that your code effectively means this:

var temp1 = "string1" + b;
var temp2 = c + "string2";
a = temp1 || temp2;

If you want the string to start with "string1", end with "string2", and have either b or c in the middle, then you can wrap the || section in parentheses to ensure it’s evaluated before the concatenation.

a = "string1" + (b || c) + "string2";

Example:

function log(msg) {
  document.querySelector('pre').innerText += msg + '\n';
}

var a;
var b = false;
var c = "__C__";
a = "string1" + (b || c) + "string2";
log(a);

b = "__B__";
a = "string1" + (b || c) + "string2";
log(a);
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solved Does || operator disable further concatenation? [closed]