/
tools.js
58 lines (42 loc) · 1.04 KB
/
tools.js
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var promise = require('./promise');
function when(value) {
return promise.isThenable(value) ?
value :
new promise.Promise(value);
}
exports.when = when;
function all(promises) {
return promise(function(resolve, reject) {
var pendingCount = promises.length;
var values = [];
function checkDone() {
if(pendingCount === 0) {
resolve(values);
}
}
function onFulfilled(i) {
return function(value) {
values[i] = value;
--pendingCount;
checkDone();
}
}
for(var i = 0; i < promises.length; i++) {
when(promises[i]).then(onFulfilled(i), reject);
}
checkDone();
});
}
exports.all = all;
exports.wrapAsyncSimple = function wrapAsyncSimple(fn) {
return function wrappedAsyncSimple() {
var args = Array.prototype.slice.call(arguments);
var _this = this;
return promise(function (resolve) {
args.push(function callback() {
resolve.apply(null, arguments);
});
fn.apply(_this, args);
});
};
};