@blueprintjs/core
Version:
Core styles & components
64 lines • 2.13 kB
JavaScript
/*
* Copyright 2020 Palantir Technologies, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { CLAMP_MIN_MAX } from "../errors";
/** Returns whether `process.env.NODE_ENV` exists and equals `env`. */
export function isNodeEnv(env) {
return typeof process !== "undefined" && process.env && process.env.NODE_ENV === env;
}
/**
* Returns the difference in length between two arrays. A `null` argument is
* considered an empty list. The return value will be positive if `a` is longer
* than `b`, negative if the opposite is true, and zero if their lengths are
* equal.
*/
export function arrayLengthCompare(a = [], b = []) {
return a.length - b.length;
}
/**
* Returns true if the two numbers are within the given tolerance of each other.
* This is useful to correct for floating point precision issues, less useful
* for integers.
*/
export function approxEqual(a, b, tolerance = 0.00001) {
return Math.abs(a - b) <= tolerance;
}
/**
* Clamps the given number between min and max values. Returns value if within
* range, or closest bound.
*/
export function clamp(val, min, max) {
if (val == null) {
return val;
}
if (max < min) {
throw new Error(CLAMP_MIN_MAX);
}
return Math.min(Math.max(val, min), max);
}
/** Returns the number of decimal places in the given number. */
export function countDecimalPlaces(num) {
if (!isFinite(num)) {
return 0;
}
let e = 1;
let p = 0;
while (Math.round(num * e) / e !== num) {
e *= 10;
p++;
}
return p;
}
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