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58 lines
1.4 KiB
TypeScript
58 lines
1.4 KiB
TypeScript
/**
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* Creates an array of elements split into groups the length of `size`.
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* If `array` can't be split evenly, the final chunk will be the remaining
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* elements.
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*
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* @param {Array} array The array to process.
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* @param {number} [size=1] The length of each chunk
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* @returns {Array} Returns the new array of chunks.
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* @example
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*
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* chunk(['a', 'b', 'c', 'd'], 2)
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* // => [['a', 'b'], ['c', 'd']]
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*
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* chunk(['a', 'b', 'c', 'd'], 3)
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* // => [['a', 'b', 'c'], ['d']]
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*/
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export function chunk(array: any[], size = 1) { // tslint:disable-line:no-any
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const length = array == null ? 0 : array.length;
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if (!length || size < 1) {
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return [];
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}
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let index = 0;
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let resIndex = 0;
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const result = new Array(Math.ceil(length / size));
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while (index < length) {
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result[resIndex++] = array.slice(index, (index += size));
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}
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return result;
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}
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/**
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* Takes a multidimensional array and converts it to a one-dimensional array.
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*
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* @param {Array} nestedArray The array to be flattened.
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* @returns {Array} Returns the new flattened array.
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* @example
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*
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* flatten([['a', 'b'], ['c', 'd']])
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* // => ['a', 'b', 'c', 'd']
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*
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*/
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export function flatten(nestedArray: any[][]) { // tslint:disable-line:no-any
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const result = [];
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(function loop(array: any[]) { // tslint:disable-line:no-any
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for (let i = 0; i < array.length; i++) {
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if (Array.isArray(array[i])) {
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loop(array[i]);
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} else {
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result.push(array[i]);
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}
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}
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})(nestedArray);
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return result;
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}
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