typescript-nullable/dist/index.js

A TypeScript Nullable<T> Type and Monad Compliant Utility Functions

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var isNone = function (nullable) {
    return nullable === null || nullable === undefined;
};
var isSome = function (nullable) {
    return nullable !== null && nullable !== undefined;
};
var mapHelper = function (func, nullable) {
    return nullable !== undefined && nullable !== null
        ? func(nullable)
        : null;
};
function map(func, nullable) {
    return arguments.length === 1
        ? function (nullable_) { return mapHelper(func, nullable_); }
        : mapHelper(func, nullable);
}
var maybeHelper = function (defaultVal, f, nullable) {
    return nullable !== undefined && nullable !== null
        ? f(nullable)
        : defaultVal;
};
function maybe(defaultVal, f, nullable) {
    return arguments.length === 2
        ? function (nullable_) { return maybeHelper(defaultVal, f, nullable_); }
        : maybeHelper(defaultVal, f, nullable);
}
var withDefaultHelper = function (defaultVal, nullable) {
    return nullable !== undefined && nullable !== null
        ? nullable
        : defaultVal;
};
function withDefault(defaultVal, nullable) {
    return arguments.length === 1
        ? function (nullable_) { return withDefaultHelper(defaultVal, nullable_); }
        : withDefaultHelper(defaultVal, nullable);
}
var andThenHelper = function (func, nullable) {
    return nullable !== undefined && nullable !== null
        ? func(nullable)
        : null;
};
function andThen(func, nullable) {
    return arguments.length === 1
        ? function (nullable_) { return andThenHelper(func, nullable_); }
        : andThenHelper(func, nullable);
}
var apHelper = function (targetNullable, applicativeNullable) {
    return (targetNullable !== undefined && targetNullable !== null)
        && (applicativeNullable !== undefined && applicativeNullable !== null)
        ? applicativeNullable(targetNullable)
        : null;
};
function ap(targetNullable, applicativeNullable) {
    return arguments.length === 1
        ? function (applicativeNullable_) { return apHelper(targetNullable, applicativeNullable_); }
        : apHelper(targetNullable, applicativeNullable);
}
exports.Nullable = {
    andThen: andThen,
    ap: ap,
    isNone: isNone,
    isSome: isSome,
    map: map,
    maybe: maybe,
    withDefault: withDefault,
};
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