In certain computer programming languages, the Elvis operator, often written ?:, or or ||, is a binary operator that returns its first operand if that operand evaluates to a true value, and otherwise evaluates and returns its second operand. The Elvis operator is a variant of the ternary conditional operator, ? : in the sense that the expression with the Elvis operator A ?: B is approximately equivalent to the expression with the ternary operator A ? A : B.

Builders, custom typescript transformers, custom tslint rules, schematics — how not to be overwhelmed and lay it all out in your head? This article intends to lay it out for your.