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2 years ago
'use strict';
var safeIsNaN = Number.isNaN ||
function ponyfill(value) {
return typeof value === 'number' && value !== value;
};
function isEqual(first, second) {
if (first === second) {
return true;
}
if (safeIsNaN(first) && safeIsNaN(second)) {
return true;
}
return false;
}
function areInputsEqual(newInputs, lastInputs) {
if (newInputs.length !== lastInputs.length) {
return false;
}
for (var i = 0; i < newInputs.length; i++) {
if (!isEqual(newInputs[i], lastInputs[i])) {
return false;
}
}
return true;
}
function memoizeOne(resultFn, isEqual) {
if (isEqual === void 0) { isEqual = areInputsEqual; }
var lastThis;
var lastArgs = [];
var lastResult;
var calledOnce = false;
function memoized() {
var newArgs = [];
for (var _i = 0; _i < arguments.length; _i++) {
newArgs[_i] = arguments[_i];
}
if (calledOnce && lastThis === this && isEqual(newArgs, lastArgs)) {
return lastResult;
}
lastResult = resultFn.apply(this, newArgs);
calledOnce = true;
lastThis = this;
lastArgs = newArgs;
return lastResult;
}
return memoized;
}
module.exports = memoizeOne;