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export const isArray = Array.isArray;
export const isObject = obj => obj !== null &&
typeof(obj) == 'object' &&
!isArray(obj);
export const isNumber = n => typeof(n) == 'number';
export const isInteger = Number.isInteger;
export const isString = str => typeof(str) == 'string';
export function clone(obj) {
if (isArray(obj))
return Array.from(obj, clone);
if (isObject(obj)) {
let ret = {};
for (let i in obj)
ret[i] = clone(obj[i]);
return ret;
}
return obj;
}
export function equals(x, y) {
if (x === y)
return true;
if (typeof(x) != 'object' || typeof(y) != 'object' || x === null || y === null)
return false;
if (Array.isArray(x) || Array.isArray(y)) {
if (!Array.isArray(x) || !Array.isArray(y) || x.length != y.length)
return false;
}
for (let i in x)
if (!equals(x[i], y[i]))
return false;
for (let i in y)
if (!equals(x[i], y[i]))
return false;
return true;
}
export function toPairs(obj) {
return Object.entries(obj);
}
export function fromPairs(arr) {
let ret = {};
for (let [k, v] of arr)
ret[k] = v;
return ret;
}
export function* flatten(arr) {
if (isArray(arr)) {
for (let i of arr)
if (isArray(i))
yield* flatten(i);
else
yield i;
} else {
yield arr;
}
}
export function pipe(...fns) {
if (fns.length < 1)
throw 'no functions';
return function (...args) {
let ret = fns[0].apply(this, args);
for (let fn of fns.slice(1))
ret = fn(ret);
return ret;
};
}
export function curry(fn) {
let wrapper = function(oldArgs) {
return function(...args) {
args = oldArgs.concat(args);
if (args.length >= fn.length)
return fn.apply(this, args);
return wrapper(args);
};
};
return wrapper([]);
}
export const get = curry((path, obj) => {
let ret = obj;
for (let i of flatten(path)) {
if (ret === null || typeof(ret) != 'object')
return undefined;
ret = ret[i];
}
return ret;
});
export const change = curry((path, fn, obj) => {
function _change(path, obj) {
if (isInteger(path[0])) {
obj = (isArray(obj) ? Array.from(obj) : []);
} else if (isString(path[0])) {
obj = (isObject(obj) ? Object.assign({}, obj) : {});
} else {
throw 'invalid path';
}
if (path.length > 1) {
obj[path[0]] = _change(path.slice(1), obj[path[0]]);
} else {
obj[path[0]] = fn(obj[path[0]]);
}
return obj;
}
path = Array.from(flatten(path));
if (path.length < 1)
return fn(obj);
return _change(path, obj);
});
export const set = curry((path, val, obj) => change(path, _ => val, obj));
export const omit = curry((path, obj) => {
function _omit(path, obj) {
if (isInteger(path[0])) {
obj = (isArray(obj) ? Array.from(obj) : []);
} else if (isString(path[0])) {
obj = (isObject(obj) ? Object.assign({}, obj) : {});
} else {
throw 'invalid path';
}
if (path.length > 1) {
obj[path[0]] = _omit(path.slice(1), obj[path[0]]);
} else {
delete obj[path[0]];
}
return obj;
}
path = Array.from(flatten(path));
if (path.length < 1)
return undefined;
return _omit(path, obj);
});
export const sortBy = curry((fn, arr) => Array.from(arr).sort((x, y) => {
let xVal = fn(x);
let yVal = fn(y);
if (xVal < yVal)
return -1;
if (xVal > yVal)
return 1;
return 0;
}));
export const map = curry((fn, arr) => arr.map(fn));
export const filter = curry((fn, arr) => arr.filter(fn));
export const append = curry((val, arr) => arr.concat([val]));
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