64 lines
1.3 KiB
TypeScript
64 lines
1.3 KiB
TypeScript
export function shallowEqual(a: {[x: string]: any}, b: {[x: string]: any}): boolean {
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var k1 = Object.keys(a);
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var k2 = Object.keys(b);
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if (k1.length != k2.length) {
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return false;
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}
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var key;
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for (var i = 0; i < k1.length; i++) {
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key = k1[i];
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if (a[key] !== b[key]) {
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return false;
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}
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}
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return true;
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}
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export function flatten<T>(a: T[][]): T[] {
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const target = [];
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for (let i = 0; i < a.length; ++i) {
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for (let j = 0; j < a[i].length; ++j) {
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target.push(a[i][j]);
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}
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}
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return target;
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}
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export function first<T>(a: T[]): T {
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return a.length > 0 ? a[0] : null;
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}
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export function last<T>(a: T[]): T {
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return a.length > 0 ? a[a.length - 1] : null;
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}
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export function and(bools: boolean[]): boolean {
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return bools.reduce((a, b) => a && b, true);
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}
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export function merge<V>(m1: {[key: string]: V}, m2: {[key: string]: V}): {[key: string]: V} {
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var m: {[key: string]: V} = {};
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for (var attr in m1) {
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if (m1.hasOwnProperty(attr)) {
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m[attr] = m1[attr];
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}
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}
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for (var attr in m2) {
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if (m2.hasOwnProperty(attr)) {
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m[attr] = m2[attr];
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}
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}
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return m;
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}
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export function forEach<K, V>(
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map: {[key: string]: V}, callback: /*(V, K) => void*/ Function): void {
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for (var prop in map) {
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if (map.hasOwnProperty(prop)) {
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callback(map[prop], prop);
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}
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}
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} |