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tools.js
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tools.js
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var _ = require('lodash');
function logResult(result) {
console.log(result);
return result;
}
function logError(error){
console.error(error.stack);
return Promise.reject(error);
}
function setTimeoutPromised(duration) {
return new Promise(function(resolve) {
setTimeout(function() {resolve();},duration);
});
}
function cacheFunction(myFuncToCache, cacheDuration, hashFunction, context) {
// we need to return a different throttled function for each different parameters so memoize it
var memoizedFunction = _.memoize(function() {
var myFuncToCacheArguments = arguments;
var throttledFunc = _.throttle(myFuncToCache, cacheDuration, {trailing: false});
return function executeThrottledFunction() {return throttledFunc.apply(null, myFuncToCacheArguments);};
}, hashFunction);
return function applyMemoizedFunction() {
// apply the throttled function
return memoizedFunction.apply(context, arguments)();
};
}
function promisedThrottle(func, duration) {
// pool management
var pool = [];
var removeFromPool = function() {
if (pool.length) {
pool.shift()();
}
};
var addToPool = function(input) {
var promise = new Promise(function(resolve, reject) {
pool.push(function(){resolve(input);});
});
//return the result of the call;
return promise.then(func);
};
setInterval(removeFromPool, duration);
return addToPool;
}
function mergeToOneObject(list) {
return _.reduce(list, function(memo,value) {return _.extend(memo,value);});
};
module.exports = {
logResult: logResult,
logError: logError,
setTimeoutPromised: setTimeoutPromised,
cacheFunction: cacheFunction,
promisedThrottle: promisedThrottle,
mergeToOneObject: mergeToOneObject
};