assert - Debug an Expression in JavaScript

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  2. JavaScript
  3. assert - Debug an Expression
Assert function is commonly used for debugging, if the input expression does not evaluate to TRUE, this function throws an exception with custom error message. 

<script type="text/javascript">

//Custom Assert Function
function assert(bCondition, sErrorMessage) {
    if (!bCondition) {
        alert(sErrorMessage);
        throw new Error(sErrorMessage);
    }
}
 
// Expression returning FALSE, it throws exception
assert(1==2,"It is a error");

// Expression returning TRUE
assert(1==1,"It is a not an error");

</script>