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TypeScript expressions interface
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npm install expression-ts@1.0.0
TypeScript expressions interface.
Expression<TType, TResult> is an interface that extends Function. Module Expression contains following methods:
/*
* Throws errors if given function is not a valid property expression.
*/
validate<TType, TResult>(exp: Expression<TType, TResult>) : void
/*
* Validates given function and applies it to `target`.
*/
apply<TType, TResult>(exp: Expression<TType, TResult>, target: TType) : TResult
/*
* Validates given function and gets property name. Useful for immutable.js.
*/
getProperty<TType, TResult>(exp: Expression<TType, TResult>) : string
import * as Expression from 'expression-ts'
class Model
{
value: string;
numberValue: number;
}
let model = new Model();
model.value = "modelThing";
model.numberValue = 12351;
const logInfo = <TResult>(exp: Expression.IExpression<Model, TResult>) =>
{
Expression.validate(exp);
let property = Expression.getProperty(exp);
console.log("Expression over property: " + property);
console.log("Has a velue ", exp(model));
}
logInfo(m => m.value)
// Expression over property: value
// Has a value "modelThing"
logInfo(m => m.numberValue)
// Expression over property: numberValue
// Has a value 12351
logInfo(m => {
console.log("This should throw an error");
})
// Throws: "Expression is not a single return statement. ..."
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