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const Lib = {
makeStateContainer(intialState, renderCallback) {
let currentState = intialState
return {
set(newState, afterRenderCallback = () => {}) {
currentState = { ...currentState, ...newState }
renderCallback()
afterRenderCallback()
},
get() { return currentState }
}
},
splitAt(str, index) {
return [str.slice(0, index), str.slice(index)]
},
readFile(file) {
return new Promise(function(resolve, reject) {
const reader = new FileReader()
reader.onload = function(event) {
resolve(event.target.result)
}
reader.readAsText(file)
})
},
getQueryParam(paramName) {
const queryPairs = window.location.search.slice(1).split("&").map(k => k.split("="))
const foundPair = queryPairs.find(([name]) => name === paramName)
if(!foundPair) return null;
return foundPair[1]
}
}
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