Acme.BookStore.HttpApi.Host/node_modules/value-or-function/README.md

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# value-or-function

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Normalize a value or function, applying extra args to the function

## Example

```js
var normalize = require('value-or-function');

// Values matching type are returned
var isEnabled = normalize('boolean', true);
// isEnabled === true

// Values not matching type return undefined
var isEnabled = normalize('boolean', 1);
// isEnabled === undefined

// Functions are called
var isEnabled = normalize('boolean', function() {
  return false;
});
// isEnabled === false

// Extra arguments are applied to function
var count = normalize('number', function(a, b) {
  return a + b;
}, 1, 2);
// count === 3

// Supply the function with context
var context = { c: 3 };
var count = normalize.call(context, 'number', function(a, b) {
  return a + b + this.c;
}, 1, 2);
// count === 6

// Values one of multiple types are returned
var isEnabled = normalize(['string', 'boolean'], true);
// isEnabled === true

// Provide a function as first argument to do custom coercion
var now = new Date();
var enabledSince = normalize(function(value) {
  if (value.constructor === Date) {
    return value;
  }
}, now);
// enabledSince === now

// Convenience methods are available for the built-in types
var result = normalize.object({});
var result = normalize.number(1);