JavaScript Is there a binary truth operator in Javascript?

What does this expression mean in Vuejs?

:class="{ expr1: expr2}"

It appears be a truth expression, but is there a binary truth operator in Javascript?

Answer:1

That is the object syntax for class bindings in Vue. If expr2 is a truthy value, then Vue will add the class, expr1 to the element.

:class is the shorthand for v-bind:class.

If that expression was on a div, for example,

<div :class="{expr1: expr2}"></div>

Then, if expr2 was truthy, the rendered output would be

<div class="expr1"></div>

Edit

Truthy values are often a cause of confusion and errors in javascript. There is however a strict equality operator that you can use to make sure that you have a true value.

:class="{expr1: true === expr2}"

That will allow you to avoid cases where expr2 might be truthy but not true.

Example.

Answer:2

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