The blog will help about How to Convert A Value to Boolean in TypeScript & learn how to solve different problems that come from coding errors. If you get stuck or have questions at any point,simply comment below.
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"" all evaluate to
false in a conditional. What if we want to treat these values as booleans in TypeScript, regardless of the original type?
let w = null; let x = undefined; let y = 0; let z = ""; let boolW: boolean; let boolX: boolean; let boolY: boolean; let boolZ: boolean;
The strict typing prevents us from assigning any of these to a
boolW = w; boolX = x; boolY = y; boolZ = z;
Type 'null' is not assignable to type 'boolean'. Type 'undefined' is not assignable to type 'boolean'. Type 'number' is not assignable to type 'boolean'. Type 'string' is not assignable to type 'boolean'.
One way to fix this is to use the ternary operator:
boolW = w ? true : false; // false boolX = x ? true : false; // false boolY = y ? true : false; // false boolZ = z ? true : false; // false
But that’s not nice to look at.
What we can do is use this trick:
boolW = !!w; // false boolX = !!x; // false boolY = !!y; // false boolZ = !!z; // false
Now you learned, How you can use & How to Convert A Value to Boolean in TypeScript.
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