mirror of
https://github.com/chanzuckerberg/cellxgene.git
synced 2026-09-25 10:58:11 +08:00
Bruce Martin
846b8d15bd
* add own range() function * lodash cleanup * remove redundant fill range implementations * remove use of _.get * sync test babel config with build * update tests to match new range implementation
46 lines
1.1 KiB
JavaScript
46 lines
1.1 KiB
JavaScript
/*
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Array range creation
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range(start, stop, step) -> Array
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This is identical to https://docs.python.org/3/library/functions.html#func-range
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Returns new array filled with a range of numbers.
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Usage:
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range(stop) - start defaults to zero, step defaults to 1
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range(start, stop, [step]) - step defaults to 1
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Examples:
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range(3) -> [0, 1, 2]
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range(1, 3) -> [1, 2]
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range(1, 5, 2) -> [1, 3]
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rangeFill(array, start, step) -> array
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Fill entire array with values, from start, by step. Returns first array.
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start defaults to zero, step defaults to one.
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*/
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function _doFill(arr, start, step, count) {
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for (let idx = 0, val = start; idx < count; idx += 1, val += step) {
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arr[idx] = val;
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}
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return arr;
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}
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export function rangeFill(arr, start = 0, step = 1) {
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return _doFill(arr, start, step, arr.length);
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}
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export function range(start, stop, step) {
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if (start === undefined) return [];
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if (stop === undefined) {
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stop = start;
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start = 0;
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}
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step = step || 1; // catch undefind and zero
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const len = Math.max(Math.ceil((stop - start) / step), 0);
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return _doFill(new Array(len), start, step, len);
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}
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